I'm pretty sure Martinez can't make 154, and even if he did I think that is too much of a step for Pacquiao. The winner of Bradley/Alexander is the logical choice in terms of being the same size, considering that Pac really is a small welterweight. And I really don't think he needs to fight Martinez or Williams to secure his legacy. It's already set. In fact any victory over an elite opponent now only enhances it not secure it.