i think that would be an awesome fight next may.. sergio can easily come to 154, and he wants mayweather there anyway. and maybe can get pac to come there eventually.. i think its a better move then to go up.. its sum fights for him at 160 but he'd have bigger fights at 154 money wise.
Pac will never fight Martinez. Ever ever ever. He wouldn't fight Cotto at the full 154, he isn't going to fight the middleweight champ there.