The one element people leave out of the equation is TRAINING. The early studies on steroids by the AMA concluded that steroids don't work and "in no way enhance athletic performance" or build much muscle. They build some muscle in absence of training but it's not functional. But this was because the studies did not involve weight training.
The "BROS" realized that training and gear are synergistic. It can't be a coincidence that the two hardest, grainiest, densest bodybuilders are generally considered Yates and Coleman. And they TRAINED the hardest(and both paid the price physically). The anabolic hormones will only go to dense, real muscle growth if the TRAINING stimulus is intense enough to necessitate it. You can use insulin and GH and other things to get pure size, but it won't be dense, hard muscle, which is why guys are being called "out of shape" now. It's not they are not dieting hard enough, it's that the actual muscle is not as hard and dense as that created by the synergy of gear and intense training.
So whatever Ronnie was taking at his best is the MAX. Because he's in a wheelchair so it's obvious the joints can't handle more intense training. Other guys like Dillett or even Flex tried to play the size game, but the muscle looked poofy and softer when they got too big, like the guys today. You can't separate the gear from the TRAINING. You can up the dose all you want and get size from satellite cells and hyperplasia and insulin and all that shit, but when it comes to hard, dense muscle Ronnie and Dorian were it.
Whatever THEY took, which no one knows, is the limit of how much shit you can take and have it turn into hard, dense muscle through the anabolics being used for muscle repair and growth. That's the way the body naturally builds muscle, and you can't fool the body. You'll just get sick because the extra drugs will make organs and other shit grow because it's more than is needed for muscle repair and growth. So unless somehow guys could start training harder than Ronnie and Dorian, you can up the dose all you want and it won't matter. The guys are so much bigger today but the lifts aren't going up much in 20 years. Means the muscle is not functional and it shows onstage. ITS THE TRAINING!!!!!!!! Mentzer/Jones were right(until they went insane).
BTW, this is complete bro science by Notomorrow, total fuckin theory and I am not a guru or wanna be "researcher" or whatever the fuck Leo is. That's why my bro shit is in gossip and opinions so don't hate.