Penn? I think Penn beats all LWs except for any who are very quick. Gilbert isn't on the quick side. Oh, I think Diaz beats Penn as well but not because he's quick.
Penn is retired, so that's not even an argument worth acknowledging.
Gilbert has the all around game to hang with anyone. There's only 1 other fighter that I think compares, and that'd Bendo. Oh well, I'll stick true to my guns until proven otherwise. I'll have to wait because it doesn't look like it'll happen in 2012 that's for sure.
I've been saying it for a couple years now, so it'll be even sweeter when it's done