I'm personally under the impression Tolkien changed his whole view about them.He could easily do so,as none of the material had been published.
Also,I think they wouldn't go all the way from far to the east to Mithlond to pick up Curumo...considering they didn't fly planes. It seems far more likely Curumo went to them instead.
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Nothing is evil in the beginning,even Sauron wasn't
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