If Ebenezer is killed dresden files would take a giant turd in story telling. Ebenezer is just to good of a character to kill off...put his butt in the hospital 1st.
Nah, he actually is a character that has to go in battle, to be killed. He is the overpowered tank that helps you feel like victory is assured. An example of this is the tiger in the TV show The Walking Dead. The tiger was badass, could take things out left and right. You felt that everything was going to be fine with it around.
But that makes for a boring story.
They killed the tiger.
Unless Eb is on the opposite side of Harry, Eb's character makes the tension of the battle not as great as it could be because you feel like his power alone could save the day. Then add in the staff and you feel like victory is assured.
So to amp up the tension, Eb should die.
But with my theory on this, Eb will die, with Harry either having already lost the WK mantle or Eb's death being the cause of the loss. Harry gets the Blackstaff, given to him by Eb because Eb knows that the council cannot have it anymore, that it truly cannot be trusted. Thus giving Harry power, separating him further from protective powers, and keeping the staff away from Mother Winter, whom Jim said would be a bad thing if Mother Winter got her walking stick back.