Generally speaking, I have problems with the argument that to truly “get” an author’s decisions you have get his references or antecedents beyond what the average reader would know, just because it’s such a good way of getting the author out of criticism.
I'm sure you're right, that advocates for a writer can make elaborate (but unconvincing) defenses of their favorite based on claims about the author's allusiveness, etc. On the other hand, in fact authors
do make such allusions. Sometimes they may rightly assume that most readers would perceive those allusions. Tolkien's likely allusion to
Pickwick could be an example; Dickens's book once was part of the furniture of a great many readers' minds (and the birthday speeches "work" on their own level even if one doesn't suspect the Dickens possibility). But never mind Tolkien. We suspect or know that even quite "esoteric" allusions may be found in, say,
Love's Labour's Lost, or any number of other works, notably in the 20th century, such as in Yeats's poems, where the
esoteric no longer needs quotation marks, but really
is present.
But having said that, I should say that I think one of the good things about
LotR is that it is
not generally a work marked by literary games-playing. That would be contradictory to Tolkien's deeply held beliefs about the integrity of a "sub-creative" work of the imagination. I should revise my remark about a "meta-narrative." What I meant, rather, was that Tolkien is a more resourceful writer than he is sometimes given credit for being. I think he is drawing, likely without realizing it, on the whole British literary tradition, not in order to write a postmodern book but because his imagination has absorbed so much and because he loves so much.
LotR is not, in some postmodern way, all about the author being Clever. It's a work of imagination, but an imagination that has deep roots in a literary heritage and a language and landscape -- the last-named being not only the landscape of the English Midlands but of Europe. It is a labor of love indeed.