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Respectfully, I'm tired of the argument that being an expert won't make you a great teacher and lots of great teachers aren't brilliant.

But experts can definitely be bad teachers, for the same reason that my DD was not a good "mentor" for the kids in her K class who didn't know how to read. ("What? You just...read it.")

I don't think this should be used to justify lack of knowledge, though. On that, we agree.