@TheSilverVulture One big problem I could see with #2 is that the X-Men universe and the MCU universe have different time travel rules(at least it seemed that way to me). A thing called the Omniverse exists in Marvel Comics where every story, failed story, idea, whatever exists apart of it. So they could explain this as the X-Men universe exists in a separate multiverse as the MCU one, thus that allows for different time travel rules.