178 is more than a reasonable catch-weight for Mayhem, Miller is just wanting Diaz way out of his comfort zone before he fights him. I bet Nick doesnt even walk around at 185, the only reason he has fought around that weight before is because it was against very small MW's, one of which is now WW and the other is retired.
Mayhem is a very strong MW these days and is too big for Diaz at that weight. 178 is the perfect weight to fight at and the ball is in Diaz's court as far as am concerned he is after all a world champ, what gives mayhem the right to start demanding things?
So Mayhem "Dont be scared, Homie" and fight him at 178 you *****.
BTW am a big fan of both lol, but i dont like how Mayhem is trying to pressure the world champ into fighting him on his terms.