Yeah, everyone's pretty much on point here. He has had two fights with Frankie... one was close with the slight majority leaning his way... the second was close with the heavy majority leaning towards Frankie.
If he gets a couple more wins like this one, his stock will rise. GSP has proven you don't have to stop the opposition to be considered great, just dominate them.
I also agree that being on the bad end of one of the most famous MMA highlight moments ever courtesy of Showtime has at least a little effect on his stature. If I were Benson, the Pettis rematch would be the absolute top of my to do list.