The thing you have to remember is that multiple people can play the masked attacker until the reveal. So it is a safe-ish bet, not gaurantee.
If the theory is right, the I think it will be a matter of SLK v Tora in who will leave. Momo only joined late last year. And honestly, both routes would be interesting, but I feel as though SLK leaving would not be the best because she has thrived so much in Oedo Tai. Even if she goes through a redemption arc and say rejoins Stars, I feel as though it would be a backwards move development wise, and I don't see her fitting in Queen's Quest after leading Momo out and her rivalry with AZM. She does not fit in DDM, God's Eye is unlikely since she'd be behind Syuri and I feel as though now she has kind of earned the right to be a big hitter in a unit. Then I doubt she is much of a dancer for Cosmic Angel's.
Tora because she has been gone long enough, she would have a chance to shift her character if she is out of OT. An injury can be a chance.
