If he stops Gomi, it'll be on cuts or by sub. He has great snap to his punches, but he's not going to knock Gomi out.
He can't be a LW forever.. At some point he will be draining himself, and it will surely cost him a fight. I think Belfort is hurting himself fighting at MW instead of HW. Sure he took his chances, thinking he'd have a better shot in a lower weight class, but he can't just slim down in his 30s after being a 200 pound fighter his whole career. Lynchburg could be on to something. If Diaz is his usual self after dropping down in weight, he will win this.