Diaz-Riggs 2 at 170lbs?

So, what's the over under on Diaz's weight? I'm saying he comes in at...192, and gives up 20% of his purse, then whips on Diesel. Are there any good 170lbers for Diaz to fight outside the UFC? He's fighting mismatches, basically, though doing a good job of putting those mismatches to bed as he should.
While I still think Diaz is the prince of ass-clowns, he's a damn good fighter. I'd like to see someone bust him open. What about Mayhem? They could fight at a catchweight of like 200lbs so Nick won't have to skip a bongload.