I have seen numerous times that he has helped newbies and accurately answered hundreds of questions.
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He/She/It apparently has plenty of time to dedicate.
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Therefore I nominate Quickseller for consideration of Moderator or Staff.
He certainly qualifies from my point of view, the main reasons quoted above.
His polarizing personality should not be an issue, there's other staff with that "feature".
On the other hand, is there even need for general staff right now?
I see a lack of moderation in certain "language" subforums but I don't see it in general.