Originally Posted by Super Jim
Post X3 Xavier is dead, but we have all sen the pictures with him in an X uniform. I also thought it was interesting how he wasn't in a wheelchair!
For old Xavier to be alive (since he was dead at the end of X3) we must be in a brand new present (future). This would mean that the movie effectively HAS TO have something in the past changed in order to have a brand new (Xavier alive) present (or future, depending on your point of view).
For the 1,947,384th time, Xavier was shown to be alive in his twin brother's body,who presumably is not paralyzed, at the end of X3. No need for an alternate future to explain this.