Efficiency/ technique

Important to note that efficiency of a fighter's punch is also taking into account, for example despite Anderson Silva not being as much of a heavy hitter as Jackson but ranked higher than Jackson is due to Silva having a higher success rate at finding the sweet spot than Jackson who has worst technique. So despite this ranking being based on a full stamina clean shot in theory Silva is more likely to land exactly on the button than Jackson is also of note in this comparison is level of competition fought.