The thing is its very likely Coleman and Cutler would have also been the best Natural Bodybuilders in the world. The best clean athletes make the best dirty athletes.
Many people believe so, but i disagree. It's an argument often used to trivialize drug abuse.
One of the most important factors for a world class athlete is talent, or genetics.
If you train naturally, you need good genetics for being big and strong, for recovery, utilizing food etc.
But if you juice, you need good genetics for responding to the juice and resisting the side effects as well. Some people take drugs and respond mainly with side effects, others get away with comparatively small side effetcs. Some get huge with little doses, others need more. You need a healthy liver for sure to become a bodybuilding champ
You cannot know how good Jay, Ronnie and the other pros would be as naturals. Better than most probably, but it wouldn't be the same athletes on top if there was no juice.