Leonard Scott is the guy I was trying to think of; wasn't much of a player but he could fly. Sam Grady (sp?) ws also an elite track guy who couldn't catch a bus with a ticket. He was so fast that the Denver Broncos tried to fit him onto their team after he couldn't even get off the bench in Knoxville. Then of course, Willie Gault.
Track wise, we could do a little research to see which of those three were actually the fastest. Coker also ran some track but I don't think he had the success of those three.