birdie_man
Instructors, such as for instance, Peter Croker and the late Tom Tomasello, might teach an early release but seemingly don't show this in their own swing when demonstrating. This is not uncommon in golf. Pros and instructors alike teaching one thing and doing another.
However, in a more general way, my post is trying to make us more aware that the human golfer is a rather complex machinery and that it is rather more easy to teach golf from the outside (effect) instead from the inside (cause) knowing the invisible exertions. I can already produce identical looking swings even with a very simple Iron Byron robot using wildly different torques.
Therefore considering real golfers with so many more variables thrown into the equation it is quite reasonable to assume that any particular golf swing is very difficult to really imitate not knowing from the inside all the various torques being at work. Moe Norman had a very simple looking swing but yet seemingly nobody is capable to swing exactly like Moe.