I agree with you about the Colorado experiment. I suspect steroids and extra conventional workouts were the reason. If you remember Arthur Jones was part of that experiment too but dropped out claiming illness. I suspect he wasn't advancing fast enough to make people impressed with the machines.
He had Mike and Ray filming Boyer going through the workouts. Boyer showed up clean. Of course he was in shape but man he was skinny. He was about as clean as a bodybuilder can be. The videos were awkward. Mike following Boyer around, with a clip board, making small talk between sets. They only made it through 3 or 4 workouts before ditching the whole idea of filming Boyers progress.
I mean this was supposed to be the proof. On film. But of course it didn't workout (no pun intended) Boyer made no progress at all. What did Casey supposedly do in Colorado? 6 workouts?
All those people he had at Nautilus, Sergio, Casey, Boyer Coe, Mike and Ray. And not once could they repeat the results of the famous experiment. Just excuse after excuse. FFS he was paying them to workout and eat! The worlds best bodybuilders and nada.