How do you know that Costa is on so much gear it's "mind-blowing"?
Aldo hasn't changed much in the last 15 years and has always been ripped. Even more so since he dropped a weight class.
UFC has some of the most strictest testing procedures of any organization. Guys get popped even for even the slightest trace of gear in their system.
I don't know that he is, but I also don't know that Ronnie Coleman was during his Olympia reign either, but I'd still bet the house that both are!
I know Aldo has always been ripped, and I realize he is very light, but still. That type of leanless and muscle fullness is not normal.
I know UFC is well known for their drug testing policies. But the top guys just stay one step ahead of the testing.
You're telling me you think that Costa and these other top guys are Natty? If that's the case, if Costa jumped on the gear he would destroy the Olympia Physique or Classic competition with ease if he was geared.