[Galin]

Originally Posted by William Cloud Hicklin

Or is Christopher saying that, without a bound book ready to hand and his manuscripts in disorder, his father's memory couldn't keep it all straight?

I think he's saying that as well -- after the first sentence about consistency with already published works

Which brings up another issue: if Tolkien simply forgets something already in print and "steps on it" in a late text, has he truly, consciously revised that something?

This would apply especially to the 'late writings' 1968-73, since not only was Tolkien elderly, but due to an unfortunate accident his papers had become hopelessly jumbled during the move to Bournemouth. To take one example of his fading mental powers: the Glorfindel essays state that he was now stuck with the name because it had appeared in print in the Lord of the Rings, therefore Glorfindel of Rivendell must necessarily be the same person as Glorfindel of Gondolin and an explanation of how this was possible was necessary. But of course, there was nothing whatsoever preventing him from just renaming the Gondolin hero; it seems he was getting somewhat confused (or he could have let it ride, as he did with Legolas and Galdor)

I think the late Glorfindel text II contains a good example of Tolkien following his canon: in this text he negates the idea that Glorfindel might have been Sindarin -- negating it due to what is already in print -- if Glorfindel of Gondolin is supposed to be the same person as Glorfindel of Rivendell of course. In other words, The Lord of the Rings comes first, or in other other words, JRRT will naturally try to figure out the scenario giving top priority to already published description.

In other other other words, don't break the enchantment here.

And in my opinion, in this late text Tolkien is simply choosing to see if a satisfactory answer can emerge without altering the name of the Elf of Gondolin, and if not, he has the option of altering it.

I think a good example of Tolkien's shaky memory here might be the late detail that Gondolin was occupied by a people of almost entirely Noldorin origin, which is closer to the original conception of Gondolin's folk than description found in The Grey Annals.