I've been curious about TGM since Clampett first came onto the national scene in '78 and TGM gained attention (even have a third edition version). One question I have is why do some top players and teachers that were A1's (Mac O'Gardy, Bobby Clampett, Peter Croker, Jody Mudd...) leave TGM for alternative approaches. Could it be that they really didn't understand TGM or did they take other paths because they couldn't execute? I heard Croker once say after teaching TGM for years he realized his students weren't really getting better and that's why he began exploring a simpler method.