Something I got to thinking about while reading up on Sperethiel, the Ancient Elven Language in Shadowrun; I wondered if some modern-day Elves had instead adopted the Elven languages invented by Tolkien, when a thought occurred to me: The story of the Lord of the Rings was presented as an ancient, rediscovered legend of the world before magic faded away...
...What if it turns out that was true? What if Tolkien, instead of inventing the world of Middle-Earth from scratch, had really found records saved from the end of the Fourth World, retelling of a battle between a Kingdom of Humans, Dwarves and Elves (and a Gnome-like variant race of Dwarves) against a kingdom of Orks and Trolls? The portrayal of the Orks and Trolls as Horror-Serving monsters could be little more then Historical Revision by the winners.
Perhaps then that Sindarin was an early, first attempt at translating a record in Sperethiel before the rise of the Sixth World.