Should PEDs disqualify fighters from GOAT conversations — and what does that mean for Demetrious Johnson?

LAS VEGAS — Somewhere around Year Four of his otherworldly run, Demetrious Johnson started to be thrown into discussions about the all-time MMA greats.Only casually at first, mostly as an afterthought or an honorable mention. Often the conversation would be prefaced with an ‘if.’ An easy qualifier. If Johnson could establish an outright dominance over the UFC’s flyweight class... if Johnson could add win upon win to his breathtaking streak... if questions about his popula