Will she be connected to the six? If so, maybe she should be the soul survivor of the six and the person who sort of "recruits" the new team.
I still like the idea of the six dying, and because of their death, MysTech becomes extremely powerful and begins to capture and kill mutants. Sort of like in the timeline Ava and Alison were in during their cross time caper. Mutants go into hiding underground, and that's where silver swan decides to say fuck em, lets rally and fight these bastards, forming a new team.