I think where ever Tyson would have hit Jones he would have hurt him. Roy liked to lay on the ropes and cover up while guys wore themselves out trying to hit him. He wouldn't have done that with Mike and tried to circle around in the middle of the ring. I think eventually Mike would have tapped him with something and even if it weren't clean it would have had an effect or pushed him out of a position he wanted to be in. With Roy's chin and Mike's power all it would have taken was 1 punch.