I promise Fedor does not hit harder than Chuck. Their style has nothing to do with the fact that when one lands a hard shot their opponent is KO'd and when the other does they are not. It's not like Fedor isn't throwing his hardest punches; that is all he throws. Hardest ground and pound ever? How many stoppages from it? How many of those were actual knockouts? The question isn't "who takes the win anyway they can get it" now is it?
I'm going to add carwin to the list. Did you see that Gonzaga KO? When you KO someone w/ what looked almost like a feeler punch...that's some KO power.