ND2234 wrote: At what point in a football game other than a clear break to the end zone does a football player run forty yards without cutting direction (except the go route)? Even if you run the go route enough the defense will catch on. Foot speed is what is important and vision at any position, that's what made Barry Sanders and Jerry Rice so dominate. I'm not knocking your enthusiasm for Mr. Johnson here, but come on, other than a dash to the end zone when will he ever use that 4.24 speed? How about you share some of his stats from college?
You're arguing with the choir here, as they say, my friend. No need to even have this discussion. The forty time is just one parameter that tells you how fast a guys is, running in a straight line. It does not correlate well with production (though it doesn't hurt, all other things being equal). That's why they also run the shuttle, three cone drill, broad jump, etc at the combine.
I don't know the first thing about Johnson as a player. My only comment was that was a very, very impressive forty time. That's Deion Sanders territory.