Thats funny, that he could knock out a 300 lb'er with 3 punches. Do you not understand why little guys don't fight big guys? Its because their punching power isn't that great, and if they get caught by a punch from the bigger guy, its usually lights out for the little guy. I wasn't referring to a bodybuilder, because most are flexible or quick enough to actually fight. If it was a street fight and Maywhether tried whopping someone that was about 220-230, I don't think he could. He may be fast, but the power he has doesn't mean a lot when your hitting a bigger target.
He is not striving to be the biggest, thats because he most likely can't. Not a lot of boxers can move up through the weight ranges and do well. Some do, but most can't, because they lack the natural hitting power that the heavier people have naturally. Look at Maywether, he probably doesn't have to lose a lot of weight to get into his division anyway. He is structurally small. If he tried moving up he wouldn't do well. Maybe 1 division, but probably not anymore than that.
Boxing as a sport is no more. There are way too many titles out there, and the promoters have ruined the sport. How many heavyweight champs are there, like 10 or something. What do they have 3 main ones, the IBF, WBC, and one other. Why??? There should be 1 champion per division. This is why boxing is suffering and it will never reclaim its glory that it once had in the 50's - 80's.