Alternately, the writers for the game could go with Claremont's original idea: Madelyne just looks like Jean, and is not her clone. Where this gets hilarious is when Rachel Summers pops up, since she actually was supposed to be the daughter of Scott and Jean, making the fact that Jean's with Null is a huge flag that this is an alternate past, leading to an alternate future. In another words, the devs are not going to have Scott abandon his wife and newborn kid to hang out with the ex who dumped him. This might mean that the X-Factor line-up gets changed, or is just a reserve X-Men team.