Shaw is already backstabbing them, seeds have been planted for Mystique and I think its naive to think Sinister isnt as well. I think seeing the other character's perspective and how they stay on top pf them to not be played as fools can be an interesting read
There are also other mutants in power positions that have recieved no development other than the text pages. Im talking Selene and Emplate. This could be a place to have them appear as well
Queen Selene
Jaws will drop if she joins Emma and Shaw in that vacant third chair