the above idea is for me personally the most abominable version I can imagine: Roland being a toy of forces (good, evil, Ka, whatever). Horn in this situation doesn't stand for anything but one of similar unnecessary things meant primarily for teasing him on and on; Roland himself is, as R of G said, a mythological figure - something immeasurably smaller than man, in other words (however titanic, monstrous, magic, etc). The story becomes dehumanized; all questions of redemption/salvation/free will become superfluous; Ka is left to play its foul games with its pawns, and the whole thing starts reminding of the world according to the people of Lud: history happens as demons beat their drums.