he's won his fights due to skill. I don't think he'd have done anywhere near as well in the nineties when there were actually some good fighters around but he's got talent
its just so happens that the two tallest heavyweights both hold all the world title. conincidence, i think not
Height is big succees but also his very talented and i've never see him get outboxed. if he would be smaller he would also be even more faster and can create more variation of his collection.. Lennox,Ali and Foreman was also very tall in their time
I voted 25%, so about 75% has to do with skill. You learn to best deal with your size through the skills you develop to maximize what body type you have. Marciano was able to use his small size to an advantage by staying low and moving his torso around like a contortionist.