Do people really not know what P4P means....it's not a power ranking, you don't put it in order of who is the best. It's a measure of who's skill set would take a fighter the furthest if weight and size was not an issue.
For example, Jon Jones is high on my power rankings, not in my top five in P4P because without his reach and size advantage most of his pure game is not that amazing. His striking survives with his reach and his BJJ isn't great. His wrestling is great, but one skill doesn't get you into the P4P list otherwise guys like Maia would be on it.
Power rankings and P4P are very similar but it is a measure of two completely different things. Like BJ Penn remains inside or near the top 10 of my P4P when he's not even close in my power rankings.
Think. It Ain't Illegal Yet
"Discipline Hurts Less Than Regret"