Joe had a great physique. That doesn't make him an expert in exercise science.
As to the science of exercise, well, some things make sense and others seem senseless. If it works for you, it works for you. Underneath it all we are all pretty much the same but each person is a variation on that theme of humanity and will respond according to their genetic makeup. Drugs just make that response far more pronounced.
No drugs and you'd still have a Franco Columbu or a Lee Priest but they'd just be a whole lot dinkier muscle wise. Height without steroids might mean a person will grow taller as male hormones signal the arrival of maturity and as such tend to signal your body to stop growing taller. I think that's why so many top bodybuilders today are relatively short. They started taking stuff before they reached maturity and BAZINGA! You've got a Lee Priest! "Dinkier"? Damn that reads funny!