Im sick and tired of hearing all these people crying about weight difference! If Marquez is a great boxer he will be able to go up and win, im not saying that huge weight differences dont matter but a few divisions shouldnt. Pac has moved up and he is a great boxer. Mayweather has moved up and he is a great boxer. Roy Jones moved up weight classes and he was a great boxer. If Marquez is that damn good then let him prove himself. I believe Mayweather needs to fight Pacquiao after, and then Cotto(if he gets past Clottey), and then whoop Mosely's old ass for fun, for him to cement in my mind as an all time great.
Floyd needs to fight the top 147 champions and stop fighting smaller guys he has every single advantage over. Thats the fuss man.
All things being equal, the size advantage wouldn't be a big issue. The problem is, as has been mentioned ad-nauseum, Floyd has all the advantages(Size, speed, youth, reach, etc.).
Get off Margo's nutsatsch Margarito was a Welter fighting the other welters PBF never dared to(Clottey, Cotto, Williams, Cintron.....) You don't want to take this there.:deal
Margarito is a welterweight who made a career calling out, cheating and losing to fighters half his size.
floyd has all the physical advantages in the tale of the tape. he also has the advantage of youth and speed as well as probably a 5+ lb weight advantage during the fight. mayweather is simply the bigger guy.