I've always run under the assumption that the remaining members of the Circle of 9 weren't the ONLY survivors. It's like the cast of LOST: there were 40 or 50 people on the plane that crashed, but they only named a dozen or so, because those are the ones the story revolved around. (In my own AU, I decided to codify that there were 128 Firstcomers originally on the Ship, and about 40 of them died in the first contact with humans or shortly thereafter, leaving the rest of them to scatter and give rise to Abode's various tribes; most of whom, this being an AU, are non-canon.) The short stories Richard wrote for the Blood of Ten Chiefs anthologies are definitely canon, even if some of the other ones are questionable, so some of the named elves in those (e.g. Seilein, Renn) must be canon too, even if they didn't show up in the Hidden Years comic.