No reason for Diaz to go anywhere. Stay at LW and fine tune your game. MMA fans are fickle, and so they'll no doubt be calling Nate a bum come tomorrow morning. But realistically Nate can still run roughshod over the LW division and work on obvious holes in the process, such as dodging leg kicks, takedown defence, movement, etc. He's still young enough that he doesn't need to vacate the division. I don't think moving down would be the answer.