I don't see how anyone can look at Mayweather as P4P #1. He has fighters surrounding him that could very easily tear him apart (Cotto, Hatton, Margarito, maybe even Freitas at 140). Calzaghe has NOONE that poses a threat to his record, he gives it his all unlike Floyd, and is just more exciting in general. Mayweather doesn't make sense at #1, not until he learns to throw with conviction anyway :P