Eric Bolte-USA TODAY Sports
If you are to believe Nick Diaz, he may be done with the sport. But we've heard that before from him. It is more likely he fights again later this year.
Diaz is a fighter's fighter. He doesn't back down and he wants to fight only the best. Unfortunately, after losing soundly to GSP, he won't be in title contention anytime soon at 170. There are decent fights there for him, but it makes more sense to go back to middleweight in an attempt to fight Anderson Silva.
If Diaz wants a fight like that, then there isn't a better option than Yushin Okami.
Okami is currently ranked third in the division, but he is nowhere close to a title shot against Silva. He was TKO'd by the champion, and does not have an exciting style that makes the fans demand that rematch.
The UFC should explore putting Okami against Diaz. If Diaz, wins he can take the fight against Silva whether Silva beats Weidman or not, but if Okami wins, he keeps his spot in the rankings and draws a little closer to earning another title shot.