At the end of it, Oscar doesn't have too many fights left so he is doing what every boxer at the end of their career does and goes after big money fights. Biggest money fight outside the rematch with Floyd is Pacquiao and maybe Hatton.
Cotto and Margy showed when they fought each other that they don't sell that well, especially Margy. And nobody knows who Williams is because nobody will fight him.
Once Floyd comes back, because he will, him and Oscar will have their rematch.