[Inziladun]

Originally Posted by Zigûr

In The Return of the Shadow we can see that at several points Professor Tolkien intended Glorfindel to be a member of the Fellowship only to ultimately reject his inclusion: "No Glorfindel" being the abrupt note in one of his planning sections. I feel very certain some explanation was given for this in the notes but I cannot find it. Perhaps I imagined it.

I found the references you note, as well as looking at all mentions of Glorfindel in the four HOME volumes concerning LOTR. I didn't see any sort of explanation for the change either, but it appears that the next idea for the Fellowship had them all being Hobbits, so maybe that gave the Professor pause to consider other ideas.