Cotto brings nothing that will give PBF any problems. The only guy I can see posing a challenge is Mosley. Pacmans style allows him to beat fighters more brutally than PBF but noone can touch PBF so his opponents all go out the same, with one more loss. Say Pacquiao totally KOs Hatton, I still wouldnt question Floyds superiority. Pacquiao would still loose. Styles make fights. If your inferior to Manny, you will be beaten senseless. If your superior (like Floyd), he doesnt do much. Mayweather though is not a power puncher but a defensive counterpuncher. He makes everyone look the same.