Anderson Silva is IMO the best fighter P4P.
I'm a big fan of GSP though, and loved the way he dominated Hughes.
But Silva, he's got reach, size and a superior standup game.
And his ground game ain't bad either, his size would be a concern for GSP in the guard, how to reach over.
Anderson could use both an open and a closed guard, so many options at bottom position. And of course, great elbows.
But I think the man with the best potential for being the best pound for pound, is Thiago Silva. His rape of Houston Alexander was absolutely beautiful.
He could also drop down into middleweight for a few fights.
