Floyd's best weight and Pacquaio was a bit weight drained at 130. Pacman would be kd'ed multiple times on his way to a late KO loss
Pac was 145 in ring for the 2nd Marquez fight...He was a huge junior lightweight. Floyd was having serious trouble making 130 against Chavez. He rehydrated to 138.5 against Chavez and that was his last appearance at 130. Floyd of the Corrales fight would be outweighed by at least 10 lbs against a guy who was just as fast and even more powerful.