Granted, the roster for the X-Men team have become painfully fuzzy and confused as hell in the last 20 years, but I think a new character which TRULY had huge potential to become a fan favourite was Maggott.
I loved his powers, they felt fresh and unique. I loved his appearance and it hurts that they got rid of him from the X-Men.
What do you think about it? Call me crazy, but I find Maggott to be infinitely more interesting than Gambit or the last characters they introduced in the roster. IMHO.
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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
http://x-continuity.blogspot.com
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).