I don't quite understand the poll here, the fact that i may or may not think that he possesses the ability to finish fights doesn't matter in the P4P rankings.
Of course, i voted that GSP is the number one guy. He has demolished everybody in his way. Stopping them or not, he makes world class fighter's look like amateurs, total dominance. Not to mention he just defeated Jake Shields who was a legit P4P fighter before the bout.
Right now i'm going with 1. GSP 2 Anderson Silva