Ill say it one more time for the people who doesn't know the difference between speed in a 40time and speed on the field.
The 40 yd dash is nothing but running in a straight line. It's all about having the "right technique". Thats why prospects work so hard on how to run a 40 right. People can better their 40 times.
Some players who doesn't have a fast 40 times are much faster on the field. Football speed is different from 40spd.
More than just the 40 time we're looking at. Can you deny that Colin runs through a lot of wide open holes? It's easier to accelerate when your not having to dodge tacklers.