LEO: Jason Babin, Andre Branch, J.D. Griggs
Defensive Tackle: Tyson Alualu, Roy Miller, Sen'Derrick Marks, T.J. Barnes
Defensive End: Austen Lane, Jeremy Mincey
The Jaguars defensive line was horrible last year. The team had a league-low 20 sacks, while the defensive line was at least partly responsible for allowing the third-most rushing yards per game (141).
GM Caldwell didn't do much to address the poor pass rush, but it could still be an improved unit due to Coach Bradley's defensive scheme.
Jason Babin and Andre Branch fit into the LEO role, which is designed for a fast pass-rusher who uses his speed to pressure the opposing quarterback. Babin played well after being picked up off waivers last season, and he should thrive in the new role. Branch was non-existent as a rookie, but the new scheme should allow him to contribute.
In addition to Babin and Branch, J.D. Griggs could be a rotational pass-rusher at the position. He was one of the most impressive players (per Ryan O'Halloran of The Florida Times-Union) at rookie minicamp and was signed to a contract for his play. He has a long way to go to make the roster, but he could find a way onto it if he continues to turn heads.
Jeremy Mincey and Austen Lane will work on the other side and will be asked to hold the edge against the run as well as rush the passer.
The major improvements came at defensive tackle.
Tyson Alualu and Sen'Derrick Marks will be asked to be penetrating players who can pressure the quarterback. This should benefit Alualu, who has never been able to live up to the expectations of being the No.10 pick in the 2010 draft.
Roy Miller and T.J. Barnes won't show up much on the stat sheet, but they'll play a crucial role in eating space and taking up blockers. Miller played a key role in the Tampa Bay Buccaneers top-ranked run defense.
Barnes, an undrafted free agent out of Georgia Tech, won't have any issues taking up space. He's a mountain of a man (6'6", 369 lbs) and will clog the middle of the line and allow the others the run free.
GM Caldwell didn't make any flashy moves to improve the defensive line, but the group should be better as a whole.