I made an account just to discuss this book. I think the reason there is such a huge discussion is because Drew ****ed us, in being clear about the ending. If I hadn't found this thread and looked at spoilers, I would still be under the impression that Bane was successful with his essence transfer.
However, he tells Cognus that Bane is dead. I thought this was done to show her that the rule of 2 must be obeyed, giving her the first real lesson as a sith. If he had been like "y0 its me Bane but I have **** and a vag now", Cognus would have less respect for him, and the Rule of Two in general.
I'm going to stick with my gut and say that Zannah = Bane, even though Drew completely ****ed this up.
Edit: Also
"Still, some people interpreted the scene that way. I guess I can see it, but you’re making a lot of assumptions to come to that conclusion. First, Zannah is asking Cognus questions that Bane already knows the answer to. Yes, it could be part of “tricking†Cognus, but that assumes Bane would *want* to trick Cognus. And I honestly don’t know where people get that impression from. Bane WANTED a stronger successor to overthrow him; the only reason he learned the ritual was because he needed to prolong his life if Zannah proved to be weak. Yet somehow people made the jump that Bane not only took over Zannah’s body, but was then hiding the fact from Cognus in order to later take over her body… possibly in a line all the way down to Sidious himself. (That is NOT what I was trying to imply, but a lot of readers went there.)"
Then why even have him try the transfer in the first place?