When somone said "not everyon you brought to heaven brought in to heaven" on Twitter hill said they know where hes going but it's not a rebellion.
I think there the people that have no reasion to be with/ or lost faith in the xmen, look at Laura, the first arc of her last run she was literally stopping people from doing what Xavier is doing now,them being the group that says "what your doing is really creep and going to backfire badly" and not blindly following Xavier make sence