NFL Combine 2012 Results: Robert Griffin III and Prospects Disproving Concerns

Every prospect faces doubts heading into the NFL Combine, but only a lucky few are able to convincingly disprove them.

It doesn't matter if those concerns are based on height, strength, speed or mentality—a prospect can boost or cripple his draft stock based on how he deals with his perceived weaknesses.

Since it's no fun to dwell on the negative, let's focus on the prospects who disproved their pre-draft concerns at the combine.

Robert Griffin III, QB, Baylor

There was only one concern about RG3 heading into the combine: his height, or rather, lack thereof.

However, he measured in at a solid 6'2" and 3/8ths. He's still the shortest of the top-flight quarterbacks in this class, but he's definitely tall enough to be successful at the next level.

With his height checking out, Griffin III has all the tools necessary to dominate at the next level. He's mobile, his mechanics are finely tuned and his accuracy is unparalleled. He's also a natural leader and a proven winner.

I have no doubt that RG3 will be a perennial Pro Bowler.

Brock Osweiler, QB, Arizona State

Osweiler can't disprove all the concerns surrounding his game at the combine, since a minor foot injury is keeping him out of workouts. It's also unknown how he'll handle a pro-style offense that doesn't operate primarily out of the shotgun.

However, Osweiler did quiet some critics that say he's too tall to be a starting NFL quarterback. He was listed at 6'8" in college, but he measured 6'6" and 7/8ths at the combine.

While most tall quarterbacks suffer from a lack of athleticism, that isn't an issue with Osweiler. He's got good footwork and mobility in the pocket, with the ability to occasionally scramble for positive yardage.

Osweiler will likely be a late first-round pick.

Alshon Jeffery, WR, South Carolina

Jeffery surprised onlookers at the combine, weighing in at 216 pounds. This was a definite plus considering he floated around 230 at the beginning of last season.

He'll still have to prove his speed in the 40-yard dash, and his muscle tone isn't great, but it's good to see that he's fully committed to getting in shape.

Jeffery has great hands and he should be able to overwhelm defensive backs with his size. I'd be surprised if he falls out of the top 15.