A good analogy to this is professional cycling... There's a good interview with Lars Armstrong (who we could classify as an endurance genetic freak) by Peter Attia... in that interview, Lars explains in detail the mindset of those professional athletes that are trying to get to the top of their game, especially when there is money and glory involved. These guys, including him, were trying everything and more to make sure no one had an advantage over them.
Do you really believe that in our sport, where success is so tied to PEDs use and where we have some of the most addictive and extreme personalities... a high-level pro is going to say... Oh, I'm getting amazing results from a little number of drugs... I think that's enough... I don't need to take more... LOL... Please I'm tired of the BS that some members of these board spread... Unless you were sleeping with X or Y you have no idea what they were taking
Professional bodybuilders, especially those at the top... Are using everything (and more) under the sun to make sure they have an edge over their competition and they are lying about it (and you know what I am fine with that, they should lie about it)... That's how human nature works... No one is holding back, they are pushing the heck out of their limits, especially if they are genetically gifted!