The reason I asked this at all was because I thought of a new possibility, that the Third Theme is about the union of Eldar and Edain in Beren & Luthien, and in Tuor and Idril. Obviously, Earendil, this issue of Tuor and Idril (going by memory here) brought about the mercy of the Valar. The line of Beren and Luthien brought about Dunedain, resulting finally in Aragorn/Elessar and the LotR re-enactment of the union in Elessar and Arwen. Just a guess, of course, but I'm wondering if it has traction?
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