Yeah, I do not envy you and the rest of the dev team when you get to chapter 4 because of how massively things expand, as well as the fact that pretty much all the X-Men get scattered to the winds even within their own books.Chapter 4 is when the dev team sat me down for the intervention for putting too much effort into plot outlines.
This is me informing you that while we have ideas for Chapter 4, unlike Chapter 3, we don't have anything remotely close to set in stone.
The whole X-Men being in 5 different books thing is something we'll get to when we get to it.
I can say that Null will have nothing to do with X-Factor. As the whole point of that run was to get the OG group back together.