Bullshit. Never been done. You said yourself, the solid base and competitive muscle was put on with free weights (and probably machines) to jump to the conclusion that you can max out your potential with machines is silly.
What's never been done? Putting on muscle using machines?
I never use the term "base" as in "base" muscle development. Muscle is muscle. Taking two exact clones, there would be zero difference in their muscle if one built a twenty-inch arm using just free weights compared to the other who built the exact same arm using machines.
Yes, using Ergo as my example, he built, I believe it was a 220 lb competitive physique using primarily free weights. If you want to call that 220 lb physique a "base" that's fine with me. I just call it a 220 lb physique. He then, while in his fifties, using only machines, built his physique up to 250 lbs.
I don't know why you think that I believe that one can reach their maximum genetic potential using just machines is silly. Why?
Let's take a very specific example here for both simplicity and clarity. Say, you get our two clones. One does the Scott curl using a barbell and the other does the exact same movement using the Nautilus machine since the set up is identical, i.e., forearms and elbows resting and stabilized in place by an angled platform. They do the exact same protocol whatever that may be. Three sets, five sets, once a week, twice a week... everything they do is the same. Lifestyle, diet, activities all the exact same. The only difference is one is using a barbell where the resistance only goes in a downward straight line direction perpendicular to the ground. The other is performing a movement where there is a complete full range variable resistance in a rotary fashion mimicking the movement of the joint, which moves in a rotary fashion.
What would be the result of both after, say, six months? Six years? Would the person using free weights have better results than his clone?