He's beaten Penn, who is ATM the best LW ever. So now its more of a question of the manner in which he acts in and out of the cage. Out of the cage, he appears to be one of the coolest dudes in MMA. In the cage, if he dominates a few more opponents in the fashion of Penn 2 and Maynard 3 he'll definitely be ranked #1. Once he's beaten the snot out of Melendez and the Bendo/Guida winner he'll be the best. Then they'll do the Aldo/Edgar superfight at either a catchweight or 145 and he'll be undisputed P4P #2 or 3.
Unless of course he continues to use his chin to block punches...
Sig courtesy of that photo-matic magician limba
I went out the way that I fight. I went out on my shield. That’s it. Done. --Chuck Liddell
My goal is to end my opponent --Carlos Condit