: : Except, of course,1) that Dior is called Thingol's heir in
: : places ("Elwing...daughter of Dior, Thingols heir..."), note
: : the punctuation making this descriptive of function not a name.
: : Also Dior himself states "...I am the heir of King Elwe...".
: : 2)Idril Celebrindal, Turgon's daughter, is refered to as
: : Turgon's heir. 3) Maeglin, son of Aredhel, sister of Turgon, is
: : implied to at least have the possibility of being Turgon's
: : heir.

: The chapters "Of Maeglin" and "Of Earendil and the Fall of Gondolin" also owe a great deal to Christopher Tolkien.

The implications are also present in the HoME.

: : : We know this was the law among the Noldor: when Turgon died
: : : the High Kingship passed to his fairly distant nephew Rodnor
: : : Gil-galad (son of Arothir Orodreth) rather than to his
: : : grandson Earendil. The latter was not of male descent.

: : Earendil was seven years old. Also I can say that the High
: : Kingship passed to Gil-galad because he was the eldest male of
: : the House of Fingolfin (this was, as I recall, one of the
: : reasons Maedhros gave up the Kingship to Fingolfin and in the
: : process, for other reasons as well, disinherited his own House
: : from the title.

: Gil-galad was from the House of Finarfin, not the House of Fingolfin.

"Therefore even as Mandos foretold the House of Feanor were called the Dispossessed, because the overlordship passed from it, the elder, to the house of Fingolfin, both in Elende and in Beleriand".
My statement that I can say Gil-galad was the eldest surviving male of the house of Fingolfin can be taken in the same light as this quote on the prophecy and the rule of the Noldor.(After all who had the overlordship in Aman.) If you wish you may also read the above statement to say that Gil-galad was the eldest surviving male of the house of Finwe (who was not from the dispossessed house of Feanor).