I remember someone said he ran 4.3 or low 4.4s and was the fastest RB in FCS. He is indeed not the fastest RB. However, he did test pretty well.
Here is how he did at pro day (officially)
4.53-4.56 40, 1.51 10, 38 VJ, 10'9 BJ, 4.13 SS, 6.82 3-cone, 17 reps. He should indeed get a shot.
If you guys are curious on any others I can post it here.