Huh, maybe I should re-read it...
You do not have to fight me, but Relias. (There is also Procipinee, who is not bad looking either, Relias you dog!)
True, but people here told me the same when I called dibs on the idea of the Oracle getting corrupted and becoming the FE. (Their designs were a clear give away) I did wish I was wrong though, much more enjoyable when I cannot predict what is going to happen.
But yes, I actually like your idea better, sort of like a symbolic union of the Humans and Fallen.
My guess is that she is doing most of what she is doing (attacking and killing) because she has lived knowing the future all her life, so she has come to believe that destiny is unchangeable, so if Destiny says she has to kill everyone, she accepts, although begrudgingly. Do take notice how she still remains pretty nice in the narrations, and her actual talk with Relias (via Crow Twitter) are more about revenge, which indicates that she resents what is happening, rather than embracing her corruption as she would if she had changed psychologically.