You seem to be ignoring the fact the Olympics only comes around every 4 years and is extremely competitive. One day off means you're waiting another 4 years for a chance whereas you have 4 major world titles to choice from with usually only a couple of pounds separating you between another 8. You also seem to be ignoring that the wars you are talking about happened over 15 and 12 rounds so of course they are tougher fights. The amateur game is completely different, fought at a totally different pace and has different tactics. They'll be no weight cutting trying to get the upper hand by coming in huge compared to your opponent. And a lot of pro's use these high ranking amateurs as sparring partners. Its impossible to compare Ali's Olympic gold to the war he fought over 14 rounds in sweltering heat against Frazier, which is the point. They're completely different. And highly trained amateurs will be better equiped to give it their all over 3 rounds than a fighter who trains to go at a slower pace for 12.