[Rune Son of Bjarne]

I am confused. . .

It seems that they all represent the end of a family line (if one can put it like that) within the house of Finwe.

Celebrimbor being the last of Feanor's line dying without heirs, just like Gil-galad and Maeglin.

Eldarion is the last decendant we know of. (thus being the last of Finarfin and Fingolfins line)
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That seems to make no sense, but if I was to draw a family tree you would know what I mean.

Anyways I am really confused and cannot see the forest for the trees.