Earl, don't you get it? These are guys that just do manual labour. Old men! Guys in their 40s and 50s with huge forearms and shoulders. They don't juice, yet their muscle mass doesn't diminish to nearly the extent of Levrone's after decades!
In a way, Levrone does have the perfect build for bodybuilding. When you pack mass on a small weak frame it looks more exaggerated. The point I'm making is, all that mass is from steroids!
Arnold had a similar small bone structure, yet he didn't shrink down because he trained like an animal. He didn't take nearly as much steroids. Training was more of a factor in creating Arnold's physique.