PNP is pretty meaningless. Are people arguing, "Most dominant in division"?
Otherwise, wouldn't both guys need to be identical sizes? If Silva was 6-4 with an 84 inch reach, does anyone think that Jones would beat him? Imagine Machida with a 84 inch reach .... he would be unstopable.
I guess I would argue that Cain (one of my least favourite fighters) is P4P. Has a size disadvantage against most of his competition and still wins.