[William Cloud Hicklin]

Ah, but Thingol had a 'road to Damascus' moment with regard to Men after the wolf-hunt and Beren's first death. The old Thingol would never have even entertained the idea of fostering Hurin's son.

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I suppose that's a question worth investigating: when exceptions to The Rules appeared, like Earendil, were the Valar empowered to apply the Manual of Regulations as best they could, or were such decisions above their paygrade? Tolkien hints, at the very least, in his Letters that Earendil and Luthien were part of the hidden Plan for the future of Arda, which implies direct Iluvataran guidance in those cases.

But Dior? No great Doom attached to his fate.