yeah, i know you looked that up and stuff.
i said with a few years of additional training and look up this site:
http://speedendurance.com/2008/08/22/usain-bolt-100m-10-meter-splits-and-speed-endurance/
forget the reaction time (since nfl players are measured when they start, there is no reaction time). but add the 0-10 m split time, the 10-20 split time, the 20-30 split time and roughly about the half of the 30-40 split time (i know its about 36,XX m, but hes getting faster, so i say the half of that is legit).
the result is a 4,22 40-yd-dash. pretty much around the top-times on every nfl combine. SO jacoby ford, deion sanders in his prime and i bet also randy moss in his prime could keep up with fucking USAIN BOLT for the first third. i know they couldnt keep the speed all the way, but just because they didnt train for anything over that distance. with additional sprint training, alot of NFL WRs and CBs could easily qualify for olympic finals (dont forget that usain dominates the sport currently and that you dont need to run a 9,6 every heat).