Also I think you would agree. Track speed is not always equal to football speed. I have seem guys that are blazing fast on the track that appear slow in pads. I have also seen the reverse. To your point in the other thread. On defense speed can equal eye discipline. If a CB is distracted from his responsibility by something happening on the other side of the field, then he will appear slow. Josh Kalu was an example of this. He was pretty fast straight line but often got caught looking the wrong way and had to play catch up.4 x 100 splits are pretty inaccurate. Forget the running start, but you usually try to have your fastest guy have the baton for 110 meters so he will usually split the worst yet is your fastest guy.
But if you are on a 40.5 relay team you are probably pretty fast.