I honestly feel bad for BJ. People always wondered why he compete outside of his weight class and we're seeing why now. Even I will admit it's not just arrogance, it's the desire for better competition.
Unfortunately for BJ he's already given the WW division a shot, and won the title, but as long as GSP is alive he's not reliving that glory again.
Florian and Sherk rematches... and he'll probably get the itch to move up again, or even retire.
... for the record, Stevenson would just get owned again. That rematch should never happen, IMO.