Irrelevant. You asked who exposed Silva's wrestling. Sonnen took him down at will, and kept him there.
I'm interested in if/how you differentiate between "wrestling" and "grappling". One can hardly accuse Silva of having a grappling weakness. FWIW, I'm inclined to take GSP as well as Silva.
I was actually thinking of Puerre-Paul, but Peppers is a good one too. I say we go with one LB/DE/DT, otherwise the votes will get split and they won't have much of a chance.
I'd also suggest Reggie Bush be considered. He hasn't had great success at the pro level, but he can do some things few others can/could.
I haven't see him play a down for the Phins either. However, he isn't that much older and hasn't had any significant injuries that I've heard about.