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There is no proof that Tom Bombadil and Goldberry were Maiar. It's as reasonable to conjecture it as anything else, but it's far from certain.
As for Tolkien's reason for including Tom, he liked the guy and wanted him in. When Strider first appeared in the inn at Bree, it was as much a surprise to Tolkien as it was to the Hobbits, according to one of his many letters.
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