I would say that this is being exaggerated. He may have out run one dude that had a bad angle or something. I think there is no way he was out running our entire defensive back field...or even the large majority of it...
In the 2010 NFL Combines, the top 10 fastest RB times were all posted by guys 230lbs or less, and ranged from 4.35-4.58, and only 6 broke the 4.5 mark.
Of the 6 fastest TE times, only one broke the 4.5 mark, a 6-4 225 TE (hardly a real NFL TE), and the rest were 4.56-4.69.
The fastest NFL DL was a 6-1 244 pounder at 4.64. Brandon Grahm ran a 4.72 at 6-1 268, Griffen Everson ran a 4.66 at 6-3 273.
The 10 fastest S/CBs in the NFL combines were all sub 4.5, but the fastest was only 4.43.
To put it in SEC perspective for those that tout SEC speed: UT Safety Eric Berry ran a 4.47, UF DL Carlos Dunlap 6-6 277 ran a 4.71, Bammer CB Kareem Jackson ran 4.48, and Auburn RB Ben Tate a 4.43.
Sorry, Auburn doesn't have a 6-0 290 fireplug running faster than DBs, or near the 4.4 mark. In fact, we probably don't have many DBs running 4.4.