40-Yard Dash: 4.50 (est.)
Carnell Williams has decent size, but not great. He has a nice combination of speed, toughness, and vision, and he hits the hole quickly. He's a smooth runner who has the strength to run between the tackles and the speed to bounce outside. He's also quick to find his hole and explode through it... a great cut-back runner.
Williams has good feet and uses leverage to compensate for his less-than-ideal size, running with a good lean and keeping his pads low. He has good leg drive, which allows him to break tackles. There were questions surrounding his abilities as a receiver, but he quieted critics by performing very well as a receiver out of the backfield in practices during Senior Bowl week.
On the down side, Williams doesn't have elite speed and his durability is a bit of a concern, but he did stay completely healthy his final two seasons at Auburn. He also needs a lot of work in his blocking technique and learning to identify his assignment on the blitz. If he doesn't improve his skills in this area, he will have to be spelled by a third-down specialist.
With that in mind, in my opinion he should be the third of the top-three RB prospects selected in April simply because he is more of a risk. He is probably the best pure runner of the three, however, and most likely will be picked up somewhere in the middle of the first round.
In four seasons at Auburn, Williams rushed for 3,872 yards on 741 carries (5.2 ypc) with 45 touchdowns. He also caught 45 passes for 342 yards and a touchdown.