Dude, I can probably write 10 000 words, on all the different PED they are using!
Nice you mention Bisping, and again, you're right about the eye.

I also think, but it's just my humble opinion, that EPO testing hasn't been put in place in the UFC in the years Bisping was fighting, because it was apparently too pricey, and he could have benefited like many others, of the loophole.

He is known to have great cardio, which got better with time.

Again, it doesn't mean he took steroids, or HGH.