I have a ton of friends that do 1-2 cycles per year, some of these guys been at it for 20+ years and after every cycle they shrink back to square one. If you look at guys like Dave poloumbo, he was a 300+lb off season bodybuilder but before he was a bodybuilder he was a runner or something like that and that's what he looked like. Now that he's long past steroids he's back to looking like a thin average built person. Dorian Yates is the same.
Ofcourse.
But look this way:
Lets say (this is just a horrible example), biceps has 100 nuclei in musclecells. After using steroids for some years you increase to 160.
When you stop with all steroids/PED's, ofcourse you will shrink like a tire with a hole.(You dont have same protein synthesis, you dont have same nitrogen retention++++). But if you start lifting again even natural, you have more nuclei and you will be able to be little bit more bigger than if you NEVER ran steroids.
This is a principle of "muscle memory" and having more muscle stem cells aka Satellite cells/more nuclei.
"Muscle memory is probably related to the cell nuclei residing inside the muscle."
"
It was recently shown in mice that a brief exposure to anabolic steroids recruited new muscle nuclei. When the steroids were withdrawn, the muscle rapidly shrank to normal size, but the extra nuclei remained"
A bodybuilder or anyone who used steroids and achieved huge physique will NEVER ever be able to achieve this naturaly if they stop using steroids and get back naturally. Those compounds puts your system into supraphysiological state and there are so many pathways involved.
A pro bodybuilder eat like a horse, and when they stop competiting, using less PED's, they eat less ++.
No way they are able to keep the size no matter how good maintained those Nuclei/satellit cells are