The tricky part with Kallen in this story is that, if she is to become what all of you believe to be the Zero of this story, she needs to take on an actual leadership role. In the canon anime she never actually led beyond the small unit level, she never made any strategic decisions so to speak. It was always someone else pointing her at an enemy. If she is to become Zero, as some of you keep speculating, she has to start making decisions for herself. If she becomes Zero, that is. I'll leave the direction I'm taking with her open to speculation.