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The top players in the 2019 NFL draft class are making their intentions known as they declare early, sit out bowl games and start training for the grueling predraft process that has begun with the bowls finished. Pro scouts are doing their own work now as they evaluate and rank the top players in the country.

The early-January update of my big board adds many underclassmen who have declared for the draft, adjusts for injuries and sees a number of players emerge at the top of their positions. In a year with no clear-cut leaders at many positions before midseason, we'll get clarity as the final month of the NFL calendar begins. 

Who is the top quarterback? Who rises now that Justin Herbert is returning to Oregon? Who are the best defenders in an absolutely loaded class? How many front four defenders rank in the top 20?

It's all in here.

In a draft class long thought to be a two-man race for No. 1, Quinnen Williams has crashed the party.Kevin C. Cox/Getty Images

1. Nick Bosa, EDGE, Ohio State

2. Quinnen Williams, DL, Alabama

3. Josh Allen, EDGE, Kentucky

4. Devin White, LB, LSU

5. Greedy Williams, CB, LSU

6. Ed Oliver, DL, Houston

7. Rashan Gary, DL, Michigan

8. Jeffery Simmons, DL, Mississippi State

9. Jonah Williams, OT, Alabama

10. Brian Burns, EDGE, Florida State

11. Clelin Ferrell, EDGE, Clemson

12. Trayvon Mullen, CB, Clemson

13. Deandre Baker, CB, Georgia

14. Dwayne Haskins, QB, Ohio State

15. Deionte Thompson, S, Alabama

16. Noah Fant, TE, Iowa

17. Byron Murphy, CB, Washington

18. Devin Bush, LB, Michigan

19. Montez Sweat, EDGE, Mississippi State

20. Jachai Polite, EDGE, Florida

21. Dre'Mont Jones, DL, Ohio State

22. Dexter Lawrence, DL, Clemson

23. Daniel Jones, QB, Duke

24. Yodny Cajuste, OT, West Virginia

25. Raekwon Davis, DL, Alabama

26. Cody Ford, OG, Oklahoma

27. N'Keal Harry, WR, Arizona State

28. Jaylon Ferguson, EDGE, Louisiana Tech

29. Greg Little, OT, Ole Miss

30. Hakeem Butler, WR, Iowa State

31. D.K. Metcalf, WR, Ole Miss

32. Taylor Rapp, S, Washington

33. Marquise Brown, WR, Oklahoma

34. Elgton Jenkins, OC, Mississippi State

35. Oshane Ximines, EDGE, Old Dominion

36. Joe Jackson, EDGE, Miami (Fla.)

37. Irv Smith Jr., TE, Alabama

38. Mack Wilson, LB, Alabama

39. Will Grier, QB, West Virginia

40. Jerry Tillery, DL, Notre Dame

41. A.J. Brown, WR, Ole Miss

42. Jawaan Taylor, OT, Florida

43. Christian Wilkins, DL, Clemson

44. David Edwards, OT, Wisconsin

45. Johnathan Abram, S, Mississippi State

46. Chase Winovich, EDGE, Michigan

47. Kaden Smith, TE, Stanford

48. Drew Lock, QB, Missouri

49. Julian Love, CB, Notre Dame

50. Riley Ridley, WR, Georgia

There are question marks, but Mizzou's Drew Lock has impressive arm talent.Jonathan Bachman/Getty Images

Biggest Riser: Dwayne Haskins, Ohio State

Biggest Faller: Clayton Thorson, Northwestern

Most NFL-Ready: Daniel Jones, Duke

Best Arm: Drew Lock, Missouri

Best Runner: Nick Fitzgerald, Mississippi State

Best Potential: Haskins

Biggest Question Mark: Tyree Jackson, Buffalo

Biggest Sleeper: Trace McSorley, Penn State

1. Dwayne Haskins, Ohio State

2. Daniel Jones, Duke

3. Will Grier, West Virginia

4. Drew Lock, Missouri

5. Jarrett Stidham, Auburn

6. Ryan Finley, NC State

7. Nick Fitzgerald, Mississippi State

8. Tyree Jackson, Buffalo

9. Gardner Minshew, Washington State

10. Trace McSorley, Penn State

11. Clayton Thorson, Northwestern

12. Easton Stick, North Dakota State

13. Brett Rypien, Boise State

14. Jacob Knipp, Northern Colorado

15. Jake Browning, Washington

The RB class lacks the superstar talent of a year ago, but David Montgomery is ready to start in today's NFL.Tim Warner/Getty Images

Biggest Riser: Devin Singletary, Florida Atlantic

Biggest Faller: Benny Snell Jr., Kentucky

Most NFL-Ready: David Montgomery, Iowa State

Best Third-Down Back: Singletary

Best Speed: Bryce Love, Stanford

Best Power: David Montgomery, Iowa State

Best Potential: Rodney Anderson, Oklahoma

Biggest Question Mark: Anderson (injury history)

Biggest Sleeper: Darrell Henderson, Memphis

1. David Montgomery, Iowa State

2. Damien Harris, Alabama

3. Devin Singletary, Florida Atlantic

4. Darrell Henderson, Memphis

5. Rodney Anderson, Oklahoma

6. Mike Weber, Ohio State

7. Bryce Love, Stanford

8. Miles Sanders, Penn State

9. Trayveon Williams, Texas A&M

10. Benny Snell Jr., Kentucky

11. Justice Hill, Oklahoma State

12. Karan Higdon, Michigan

13. Jordan Scarlett, Florida

14. LJ Scott, Michigan State

15. Alex Barnes, Kansas State

Hakeem Butler is new to the list and one of the fastest risers in the draft class.David K Purdy/Getty Images

Biggest Riser: Hakeem Butler, Iowa State

Biggest Faller: David Sills, West Virginia

Most NFL-Ready: Kelvin Harmon, NC State

Best Outside Receiver: D.K. Metcalf, Ole Miss

Best Slot Receiver: Marquise Brown, Oklahoma

Best Hands: N'Keal Harry, Arizona State

Best Route-Runner: Marquise Brown

Best Potential: Butler

Biggest Question Mark: Metcalf (injury history)

Biggest Sleeper: Deebo Samuel, South Carolina

1. N'Keal Harry, Arizona State

2. Hakeem Butler, Iowa State

3. D.K. Metcalf, Ole Miss

4. Marquise Brown, Oklahoma

5. A.J. Brown, Ole Miss

6. Riley Ridley, Georgia

7. Kelvin Harmon, NC State

8. Parris Campbell, Ohio State

9. Mecole Hardman, Georgia

10. Deebo Samuel, South Carolina

11. Dillon Mitchell, Oregon

12. Darius Slayton, Auburn

13. Anthony Johnson, Buffalo

14. David Sills V, West Virginia

15. Jakobi Meyers, NC State

Noah Fant will hear his name called on Day 1 of the draft.Michael Hickey/Getty Images

Biggest Riser: Caleb Wilson, UCLA

Biggest Faller: Alize Mack, Notre Dame

Most NFL-Ready: Noah Fant, Iowa

Best Slot Tight End: Fant

Best Hands: Fant

Best Route-Runner: Irv Smith Jr., Alabama

Best Blocker: Smith

Best Power: Smith

Biggest Question Mark: Albert Okwuegbunam, Missouri

Biggest Sleeper: Isaac Nauta, Georgia

1. Noah Fant, Iowa

2. Irv Smith Jr., Alabama

3. Kaden Smith, Stanford

4. Caleb Wilson, UCLA

5. Albert Okwuegbunam, Missouri

6. Isaac Nauta, Georgia

7. Zach Gentry, Michigan

8. C.J. Conrad, Kentucky

9. Jace Sternberger, Texas A&M

10. Josh Oliver, San Jose State

The talent is there, but questions still surround Jawaan Taylor.Wesley Hitt/Getty Images

Biggest Riser: Andre Dillard, Washington State

Biggest Faller: Mitch Hyatt, Clemson

Most NFL-Ready: Jonah Williams, Alabama

Best Run-Blocker: Williams

Best Pass-Blocker: Williams

Best Potential: Greg Little, Ole Miss

Biggest Question Mark: Jawaan Taylor, Florida

Biggest Sleeper: Max Scharping, Northern Illinois

1. Jonah Williams, Alabama

2. Yodny Cajuste, West Virginia

3. Greg Little, Ole Miss

4. Jawaan Taylor, Florida

5. David Edwards, Wisconsin

6. Andre Dillard, Washington State

7. Max Scharping, Northern Illinois

8. Dennis Daley, South Carolina

9. Isaiah Prince, Ohio State

10. Kaleb McGary, Washington

11. Tariq Cole, Rutgers

12. Mitch Hyatt, Clemson

13. Tytus Howard, Alabama State

14. Derwin Gray, Maryland

15. Lukayus McNeill, Louisville 

Dalton Risner is made for today's pass-first NFL.Peter G. Aiken/Getty Images

Biggest Riser: Cody Ford, Oklahoma    

Biggest Faller: Dru Samia, Oklahoma

Most NFL-Ready: Ford

Best Run-Blocker: Michael Dieter, Wisconsin

Best Pass-Blocker: Dalton Risner, Kansas State

Best Potential: Connor McGovern, Penn State

Biggest Question Mark: Michael Jordan, Ohio State

Biggest Sleeper: Chris Lindstrom, Boston College

1. Cody Ford, Oklahoma

2. Connor McGovern, Penn State

3. Michael Deiter, Wisconsin

4. Michael Jordan, Ohio State

5. Beau Benzschawel, Wisconsin

6. Dalton Risner, Kansas State

7. Chris Lindstrom, Boston College

8. Nate Herbig, Stanford

9. Ryan Bates, Penn State

10. Dru Samia, Oklahoma

11. Nate Davis, UNC-Charlotte

12. Hjalte Froholdt, Arkansas

13. Ben Powers, Oklahoma

14. Chuma Edoga, USC

15. Martez Ivey, Florida

Elgton Jenkins sits atop the center class in 2019 and has starting potential.Jonathan Bachman/Getty Images

Biggest Riser: Lamont Gaillard, Georgia

Biggest Faller: Drew Kyser, Memphis

Most NFL-Ready: Elgton Jenkins, Mississippi State

Best Run-Blocker: Jenkins

Best Pass-Blocker: Jenkins

Best Potential: Jenkins

Biggest Question Mark: Ross Pierschbacher, Alabama

Biggest Sleeper: Keegan Render, Iowa

1. Elgton Jenkins, Mississippi State

2. Garrett Bradbury, NC State

3. Ross Pierschbacher, Alabama

4. Lamont Gaillard, Georgia

5. Erik McCoy, Texas A&M

6. Keegan Render, Iowa

7. Jon Baker, Boston College

8. Jesse Burkett, Stanford

9. Nick Linder, Indiana

10. Drew Kyser, Memphis

Ed Oliver has No. 1 overall talent but could fall down the board a bit.Tim Warner/Getty Images

Biggest Riser: Quinnen Williams, Alabama

Biggest Faller: Isaiah Buggs, Alabama

Most NFL-Ready: Williams

Best Run-Stopper: Williams

Best Pass-Rusher: Rashan Gary, Michigan

Best Potential: Ed Oliver, Houston

Biggest Question Mark: Jeffery Simmons, Mississippi State

Biggest Sleeper: Khalen Saunders, Western Illinois

1. Quinnen Williams, Alabama

2. Ed Oliver, Houston

3. Rashan Gary, Michigan

4. Jeffery Simmons, Mississippi State

5. Dre'Mont Jones, Ohio State

6. Dexter Lawrence, Clemson

7. Raekwon Davis, Alabama

8. Jerry Tillery, Notre Dame

9. Christian Wilkins, Clemson

10. Gerald Willis, Miami (Fla.)

11. Isaiah Buggs, Alabama

12. Terry Beckner Jr., Missouri

13. Ed Alexander, LSU

14. Demarcus Christmas, Florida State

15. Khalen Saunders, Western Illinois

In a draft class in which Nick Bosa has long been the No. 1 prospect, Josh Allen has made a name for himself.Joe Robbins/Getty Images

Biggest Riser: Joe Jackson, Miami (Fla.)

Biggest Faller: Chase Winovich, Michigan

Most NFL-Ready: Nick Bosa, Ohio State

Best Run-Stopper: Clelin Ferrell, Clemson

Best Pass-Rusher: Bosa

Best Potential: Bosa

Biggest Question Mark: Winovich (injury)

Biggest Sleeper: Oshane Ximines, Old Dominion

1. Nick Bosa, Ohio State

2. Josh Allen, Kentucky

3. Brian Burns, Florida State

4. Clelin Ferrell, Clemson

5. Montez Sweat, Mississippi State

6. Jachai Polite, Florida

7. Jaylon Ferguson, Louisiana Tech

8. Oshane Ximines, Old Dominion

9. Joe Jackson, Miami (Fla.)

10. Chase Winovich, Michigan

11. Zach Allen, Boston College

12. D'Andre Walker, Georgia

13. Ben Banogu, TCU

14. Charles Omenihu, Texas

15. Anfernee Jennings, Alabama

The "other" Devin of the LB class, Devin Bush was Big Ten DPOY and has starting-caliber talent.Joe Robbins/Getty Images

Biggest Riser: Gary Johnson, Texas

Biggest Faller: Cameron Smith, USC

Most NFL-Ready: Devin White, LSU

Best Run-Stopper: Mack Wilson, Alabama

Best Pass Coverage: Dakota Allen, Texas Tech

Best Pass-Rusher: White

Best Potential: White

Biggest Question Mark: David Long, West Virginia

Biggest Sleeper: Ryan Conley, Wisconsin

1. Devin White, LSU

2. Devin Bush, Michigan

3. Mack Wilson, Alabama

4. Dakota Allen, Texas Tech

5. T.J. Edwards, Wisconsin

6. Gary Johnson, Texas

7. Vosean Joseph, Florida

8. David Long Jr., West Virginia

9. Germaine Pratt, NC State

10. Khalil Hodge, Buffalo

11. Te'von Coney, Notre Dame

12. Chase Hansen, Utah

13. Cameron Smith, USC

14. Joe Giles-Harris, Duke

15. Ryan Connelly, Wisconsin

Greedy Williams is not just NFL-ready, but he could also be an immediate star.Jonathan Bachman/Getty Images

Biggest Riser: Amani Oruwariye, Penn State    

Biggest Faller: Damon Arnette, Ohio State

Most NFL-Ready: Greedy Williams, LSU

Best Slot Cornerback: Byron Murphy, Washington

Best Man Coverage: Williams

Best Zone Coverage: Deandre Baker, Georgia

Best Potential: Williams

Biggest Question Mark: Kendall Sheffield, Ohio State

Biggest Sleeper: Rock Ya-Sin, Temple

1. Greedy Williams, LSU

2. Trayvon Mullen, Clemson

3. Deandre Baker, Georgia

4. Byron Murphy, Washington

5. Julian Love, Notre Dame

6. Amani Oruwariye, Penn State

7. Kendall Sheffield, Ohio State

8. David Long, Michigan

9. Michael Jackson, Miami

10. Damon Arnette, Ohio State

11. Rock Ya-Sin, Temple

12. Kris Boyd, Texas

13. Sean Bunting, Central Michigan

14. Joejuan Williams, Vanderbilt

15. Iman Marshall, USC

Taylor Rapp is looking to be the next great Husky DB to enter the NFL in recent years.Associated Press

Biggest Riser: Mike Edwards, Kentucky

Biggest Faller: Brandon Jones, Texas

Most NFL-Ready: Deionte Thompson, Alabama

Best Coverage: Thompson

Best Strong Safety: Taylor Rapp, Washington

Best Free Safety: Thompson

Best Hybrid Defender: Johnathan Abram, Mississippi State

Best Run-Stopper: Abram

Best Potential: Thompson

Biggest Question Mark: Mark McLaurin, Mississippi State 

Biggest Sleeper: Adderley

1. Deionte Thompson, Alabama

2. Taylor Rapp, Washington

3. Johnathan Abram, Mississippi State

4. Nasir Adderley, Delaware

5. Chauncey Gardner-Johnson, Florida

6. Juan Thornhill, Virginia

7. Jaquan Johnson, Miami

8. Mike Edwards, Kentucky

9. Darnell Savage Jr., Maryland

10. Marvell Tell III, USC

11. Mark McLaurin, Mississippi State

12. Lukas Denis, Boston College

13. Brandon Jones, Texas

14. Will Harris, Boston College

15. Andrew Wingard, Wyoming