I think ROy Jones Jr had the ability to hit as hard as anyone from 154-168, but he often didn't follow through on his punches, or he wouldn't set his feet. I think Hearns had greap snap on his punches and that speed, but a guy like Julian Jackson had to have straight up power to do what he did ,because people saw his punches and were still KTFO, he is one of the few guys I've seen without the speed Tyson or Hearns possessed that could do that to an opponent, probably the other guy who most comes to mind is Earnie Shavers, and they actually had pretty similar careers.