I never read Morgoth's ring but I think from what I know that the History of Middle Earth books are a bunch of ideas that Tolkien never fully developed. I don't think Sauron could return. He was a maiar spirit not a spirit of the dead as presumeably Morgoth's ring talks about. His body had already been destroyed twice and then the ring destroyed too. So his power if he had any left would be very insignificant. Also Gandalf didn't seem to have any concern when he was destroyed in the end of the third age. If Gandalf wasn't concerned and his job(helping against Sauron ) was done then I think that if Sauron did return he wouldn't be anything like the old Sauron we know and love but a mere shadow of him. He might be able to do some harm but nothing compared to the good old days. I think you bring up an interesting point and I am going to have to finish reading these History books. I want to try and get them all from the same series with the same covers which is harder than it sounds but I"m working on it.
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