But I don't understand why it's impossible... Improbable, yes. Impossible, no. Nomura could do whatever he wanted with BbS. Just because Braig was an apprentice doesn't mean that he couldn't have a secret life as the DS. Of course, it most likely won't happen. But we'll never know until the game is released.
But I guess I should just drop it. D: Neither one of us is going to convince the other. So let's just agree to disagree?