My Definitive X-Men Movie Timelines - Sebastian Shaw (Bacon) was a time traveler
Mine is a work of passion, a labour of love. Hopefully you will love it. No mean to harm, it's just a fan website focused on fixing the errors.
The "Deadpool" movies, "Legion" (series) and "The Gifted" (series) are three parallel universes; each one featuring an alternate version of the X-Men.
The main X-Men universe (X-Men + Wolverine) has been altered via time travel twice, not just one ("Days of Future Past").
This means that the timeline depicted in "First Class" (1962), "The Wolverine" (2008) and the post-apocalyptic future of "Days of Future Past" (2023) was already a massive divergence from the original, untampered version of history (the X-Men trilogy).
X-CONTINUITY x-continuity.blogspot.com (paste and copy, please)
There are extensive sections explaining more about incongruences and contradictions in the saga.
According to my scenario:
Sebastian Shaw (Kevin Bacon) was a time traveler. He was born several years after the events of "The Last Stand", in the original timeline (X-Men Origins: Wolverine; X-Men; X2; The Last Stand).
At a certain point, when he was 50 or so, he traveled back to 1912 A.C. and impacted the timeline over the years in various ways... until creating the Hellfire Club.
He also changed Magneto's life in 1944.
The events of "First Class" were deeply caused by him, as well as having many birthdays shifting in time and characters being born later or before (Angel, Jean Grey).
I guess he influenced many powerful people over the decades, impacting their lives - Warren Worthington II (Angel's father) was among them.
FC Moira was the grandmother of LS Moira, as simple as that.
Emma Frost was already existing. Maybe, in the original timeline, Emma Silverfox was a clone of her who was adopted by Kayla's family (that's it).
So in the end, we got the second timeline:
1962- First Class
1963- Magneto is arrested
1973- Mystique kills Bolivar Trask
1983- Alternate version of "X-Men Origins"
2000- Alternate version of "X-Men" and "X2"
2001- Alternate version of "The Last Stand"
2008- The Wolverine
2023- Post-apocalyptic future of "Days of Future Past"
ENJOY! Looking forward your feedback. Thanks.