I think Louis doesn't have the hardest punch like he was labelled nor does Dempsey they simply too small to punch that hard. I know its about technique, but there have been a lot bigger guys with "the punch" like Tyson and Tua for example. Foreman IMO hit very hard, but he wasn't a one punch kind of guy, and he was still 6'4 220 which is pretty skinny compared to the 6'5 240 Lennox who is 20 pounds heavier, but one inch taller. Marciano was like Pacquaio is now... a guy who wears you down more than one hit knocks you out.