If Williams won't wait for Pavlik, he won't be ready to fight again until February. Pavlik will have been out of the ring for 1 full year, so he'll want an interim fight too, and then Williams won't want to wait, and then Pavlik will have a mandatory he has to deal with, and blah-blah-blah, the cycle continues. In addition, PWilly already lost a fight to Quintana. That means on an off night he could easily lose to someone like Dizinzurik or Martinez. And the talk about getting his ass knocked out by BHop seems to be picking up steam. He would not come off a loss into a fight with KP. Sorry guys, but this is now or never.
No, Pavlik/Williams needs its own event. Cotto and Paquiao would have to take less money (not happening).