I think he's overrated by Sherdoggers. I certainly would credit him for being the best if not one of the best HW BJJ players ever in the sport. Silvia and the 2 wins against Nogs are impressive, but he has tons of losses, some of which he was totally out classed.
He was definitely fun to watch and is one of the brightest MMA minds. I hope he becomes an analyst after he's done fighting because he's great.