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The issue with Earendil was not merely that he was half-elven, but that he had set foot in the West. That was what precipitated the discussion (as well as a ban on his return to Middle-earth).* One thing that can be learned about Dior indirectly from the Earendil case is that E was a case of first impression- plainly the Valar had not considered the issue before, which means that there had been no issue raised when Dior died.
Mandos apparently got to make the call himself- his Halls, his rules. I'm pretty sure he ruled "mortal"-- especially since, as mentioned above, both Dior's parents were mortals at the time he was born. Tough luck for Nimloth I guess. (More problematical would be the postmortem fate of Elured and Elurin).
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*I'm not aware that there was any ban on returned or revived Elves recrossing the Great Sea, at least during the Second Age. Even if we take the case of Glorfindel as exceptional, we know that Elves of Eressea sailed at least as far as Numenor.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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