Valero should first fight the winner of Marquez - Diaz if he wins that then he could be in with a shout. At the moment Pacquiao has bigger fish to fry. Personaly I think Marquez would beat Diaz and Valero. I think if Pacquiao beats Hatton and Mayweather stays retired he will fight winner of Holt - Bradley for WBC light welterweight title.