It completely depends on if you are comparing the player with their playing days or if you are creating a team with that person as a player to compete in today's game. As far as explosive plays, Norwood would be #1 on that list. As far as total RB then I would give the nod to either JJ Johnson or Anthony Dixon.
I can't really base any opinion on Shorty McWilliams but he is our highest finisher in the Heisman voting. Dixon did lead the SEC in rushing the year that Mark Ingram won it.