Another interesting idea, Legate. The problem of course is that then you need to posit two Rhosgobels, which is not anywhere suggested. Whereas if we suppose that the southern location was not called Rhosgobel, we don't have that problem - but we run into trouble with the LotR quote.
I think the 'real' answer is simply that when he wrote the late note, JRRT had forgotten what he'd written many years earlier. It certainly wouldn't be surprising, nor the only instance.
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