Elmo är ingen känd person!
Citera:
The younger brother of Elu Thingol of the Sindar and Olwë of the Teleri; he dwelt in Doriath with his elder brother Thingol, and is said to have been the ancestor of Celeborn, Lord of Lórien.
(...)
The evidence for Elmo's existence consists of a very few indirect references, and he never appears in any fully developed narrative. It is quite possible, then, that this character is apocryphal. Since he appears relatively late in Tolkien's work, though, it is equally possible that his character would have been developed into the fuller stories of the First Age, if Tolkien had had the opportunity to do so.
http://www.glyphweb.com/ARDA/e/elmo.htmlEncyklopedia Arda funderar över om han dog i Doriaths fall, men - och detta blir ju totalt akademiskt - Thingol borde gått bort före Elmo ; annars borde Elmo ha fått tronen snarare än Dior? Eller?
Dior var dotter-son (och alverna hade inte kvinnlig arvsrätt som det förefaller) samt att Elmo var mycket äldre - enligt logik, om än inte fakta.