Ahman Green is actually faster than Champ, he ran a 4.18. AND, that is faster than Bennett's fastest, which is 4.27.
Anyone here watch the world's best athlete contest a while ago?
Jeremy Bloom, professional skier and former Colorado receiver (not anymore since he accepted skiing endorsements

), blew away the competition in the 40 yd dash. Ohyea, Ahman Green was also in the competition and came in third (another college WR came in 2nd).
As for Vick, he should join the speed challenge instead of the accuracy challenge. I read rumors that he ran a 4.2, but that figure seems to be exaggerated.