Every great goes through a couple controversial fights in a long career

To think that this somehow negatively affects Floyd's legacy is silly. Name me one ATG that did not have atleast one close fight that has people saying the other guy won? Heck, Ali actually had a handfull of those and he's known as the greatest. Lets also not forget that Mayweather is 37 and not in his prime anymore. What will do Mayweather good is that he rematches the toughest opponents and then beats them more clearly(Castillo and now likely Maidana as well) than the first time.