Originally Posted by X-Maniac
Why does it necessarily have to be changes caused by Wolverine that alter the future to bring the previously deceased X-Men back to life?
Well assuming only consciousness can be transferred, or brains, to simplify any technicalities, then only Xavier and Logan are in play. So why not Xavier? Good question. Is Cerebro destroyed in the future? Is it only possible using Wolverine's brain/mind? Maybe Xavier is vital in the future and Logan is the only viable volunteer. Who knows? But a Logan switchup, pre-adamantium, escaping from Stryker, and finding 70's Xavier, seems like a viable plot to me. If we were stopping Sen. Robert Kelly's death, then maybe they could have picked any of the X-Men to brain swap, but they wanted to incorporate the FC cast, so they went 1973. I think the movie will focus on Logan not only trying to stop the inception of the Sentinels, but also conjuring up ways to change his own destiny and fates of his future friends in the OT. Maybe McKellan's Magneto comes to the conclusion that his younger self must be eliminated and tells Logan to pursue this action. It's just a good way to close the books on this story and start anew with a fresh cast in the future.