Hey there. I didn't get a chance to comment before it was closed, but I wanted to tell you I enjoyed reading your theory about the keyblades. Considering I'm not the most popular person around here, you may or may not appreciate it (j/k).
But anyway, while the truth of the matter is still unknown, I thought your theory was very logical and the way you described it did address quite a few mysteries. I particularly liked the part that explained Roxas's ability to dual wield.
I don't know as I'd call it "bulletproof", but it was refreshingly new way to looks at the events of CoM and KH II, and I always enjoy theories that employ some real thought and creativity.