I've a strong suspicion I've seen a sentence in one of the books which lists a group of people and ends with "...and Aurors [ ] and [ ]." I think in that case it's being used purely descriptively, as you might say "and batsmen Fowler and Pietersen" but it may have led to confusion, along the lines of "You're nutters, the pair of you".
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I think you're right about it being a description and not a title.
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