I don't think that I know anymore about him than you do but I think that tolkien might have wanted to expand on his character but never got to doing it. Maybe tolkien needed him only for thoses few small parts to make things work. Or tolkien might have felt that there wern't enough wizards in middle-earth and decided to add a character but forgot to develop him.
Those are my guesses, I'm in the same boat as you.
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-Willie
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