diaz wasnt exposed, he just never faced an opp who had the phys ability (power/strength and durability) to blunt his forward progress; and grind him out, he faced plenty of skilled guys, lots of athletic guys and hard hitters.
but he hadnt faced a guy who could take his measure and return it in kind; freitas was not mentally there, julio lacked the phys strength and durability, lavaka lacked the all round athleticism and skills.
he faced guys w/certain adv; but never someone w/all the skills together, an when he did he got tested and failed miserably. Juan didn't quit outright; but he stopped trying to win the fight, he's a front runner... he can't come from behind. An when i sauy behind i mean when he is getting beat the f*ck up..
i called it from day one in a thread i wrote when the fight was announced; campbell has been underrated, an diaz thought nate would be unfocused or inconsistent. Nate came in focused and when he is focused only one guy has beat him; an that was a guy who was mentally tougher, more experienced, physically tougher and tech better than juan.