Correct on all counts Andu Indorian. Originally The LOTR Glorfindal was originaly to have been a descendant of the first age Glorfindal but JRR decided to elevate him in stature to the original, reincarnated (as all elves can eventually be) out of Mandos (in record time) and be sent back to middle earth in the 2nd age as a messenger to strive against Sauron (this is in various notes, not in the Book of Lost Tales), analogous to the Istari, but one of the Eldar, rather than one of the Maiar. The Story of Tour and the Fall of Gondolin in the Silmarillion was piecer together by christopher Tolkien from various JRR note and much compressed versions of the two older sories "Of tour and his arrivail in Gondolin" & "The fall of Gondolin" from the Book of lost Tales, an older version of part of JRRs Middle Earth, with much translation and continuity editing to make it fit with the Middle Earth of LOTR(Gnomes in lost tales=Noldor in later versions). Think of it as ancient oral tradition much corrupted over the years. The rear guard battle by Glorfindal (and his house of warriors) therin covers much more glory with him fighting Dragons and Balrogs before persihing in a coup de deux veuve with the last balrog. You get only a hint of his fame and prowess in LOTR with his chasing off the Nazgul at the ford, and the line by Galdalf, if decades old memory serves me. "Even if you sent Glorfindal, he could not storm the Dark Tower by himself", implying that is is somehow less rediculous to suggest Glorfindal do this than anyone else..
Gildor Inglorion is a Noldo likely connect with the house of Finrod.
We not that Frodo says, IIRC, "These are high elves, they spoke the name of Elbereth". Gildor says "We are exiles" ie. Nodor of the rebellion.