So if you write a book, that makes you a good coach?
I am not arguing he isn't a good coach, but I do find it a little strange that people in online forums who have in all likelihood never met Topo or (more importantly) been coached by him are throwing his name around as an 'essential' appointment to the coaching staff.
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I agree that writing a book doesn't equate in any way to his coaching ability.
I think the fact that he was an excellent scrummager when he played and has then spent a huge amount of time researching the issue and interviewing many other exponents of scrummaging suggests that he at least has the technical knowledge required.
Whether he can transfer that technical knowledge to the players is an unknown.