[neil]

Well put Mike.
I had a conversation with a Pro (nonTGM) about this -he had borrowed the book from me and he couldn't understand how you kept the shoulder back and still manage to look like the photos!
I explained "the gaps"in his reading and basically concluded that if you keep the shoulder back and on plane through the start down waggle (including bump)then not much can go wrong from there(with regards to the shoulder ).
Not as well put as your answer but i do try to keep out of tgm language when discussing these things with outsiders