V-E-R-Y broadly. As in, the end of DoFP is ignored. Someone is there who shouldn't be, now.
Not that stuff like that ever bothered the X-Men![]()
Not ignored (or at least not if you are talking about who I think you're talking about). Quite far from it. They just didn't spell out how they got from point A to point Z.
It's probably less of a stretch than explaining how Siryn exists as a school girl in X2 if Banshee died prior to 1973 or how Caliban and Moira change nationality, or WTF is going on with Angel's age.