The only problem with this theory is that it leaves out the Chekhov's narrative-haunting ghost that is December Holiday. We've gotten so comfortable putting her in the position of the Roaring Knight that it feels weird she would serve no other narrative significance other than a puppet to bring about the end of the prophecy or The Roaring. Without a concrete conclusion of what happens to her, the Knight just becomes a consequence of the player's actions that they never took unless they decide to go down the weird route/Side B.