I am a huge Wilt fan but him fighting Ali would have been a joke. Wilt was bigger, much, much stronger (dont fool yourself on that one) but he would have gotten killed in a fight against Ali, punching down on his head or not. It's hard to punch on anyone's head when you are lying flat on your back, I dont care how tall you are. Shaq is probably not as strong as Wilt was, more powerful yes, bigger yes, but still probably not as strong and Shaq would not stand a chance against a champion fighter. He would not be nearly as quick, not be able to generate enough power at the right time, and basically he would get his tail kicked, and kicked hard. I think a more fair battle would be the two of them playing one on one basketball. At least this would be some competition, granted not much. The fight though would not be any competition at all. It's like saying, well, Rajon is lighting fast, quick reflexes and amazing athletic ability so he could probably play a champion tennis player and be competitive- ha.