God you are acting so obtuse. LOL
People are literally giving you plausible explanations and you just want to live in your bad little box.
T H A N K Y O U
Considering all the times we’ve watched the High Elves and Blood Elves study in that Rift in game?
You’re literally doing the same thing we are. 
It’s called “study ways to reproduce it based off what we have here.” Do you people just have no brains? LOL
That’s all they do because it doesn’t fit their version of what they want. LOL
Do you see Void Elves getting gold eyes or hairstyles?
The point is, the lore has been staring you people right in the face. Between Alleria and the studies in the Rift, it’s a possibility, just like your stupid GrOw A tHiRd ArM.
LOL sad but so true!