Dior, da man

As you know, Dior Eluchil was the son of Beren and Luthien and hence Heir of Elwe Thingol (that's what Eluchil means, i guess).

Was him an elf or a man? i have always thought he was an elf. The Heir of Thingol has to be an elf, otherwise the king would go mad. But lately i've been recalling on some signs that seems to point in the opposite direction:

-He's a son of two mortals, since he was born after Beren & Luhien came back from Mandos.
-He's married to soon for an elf since he died at about 30 having had a daughter already.
-It's never mentioned that he had to choose his destiny, but if he had been a half-elven he would have to (at least when he arrived to Mandos somebody should ask him where would he want to rest for the eternity <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/ohwell.gif ALT=":\"> )

anyway, Elwing would still being a half-elven since his mother was an elf though his father was a mortal.

some light over there?