Why Imrazor the Numenorean?

[Saurondil]

Originally Posted by Ivriniel

Is that Mithrellas with a union of elf and man an indication that somehow he was exceptional? Or does the converse apply? I've often wondered about what was at work when it was a union of the two races, and why it was always, in the first generation of them, that always a female of Elven race was with a male of the Second Born.……

Perhaps because Elves were nobler in origin and powers than Men, so that such marriages “enhanced” the non-Elvish spouse ?

The female spouse in a trans-Racial union seems to help that union produce exceptional offspring:

Maia + Elf = Luthien
Elf + Man in Gondolin = Earendil
Elf + Man of Numenorean descent in Gondor = ? Likewise, presumably.