Guys don't you think Logan is MIB? My theory is as follows:
William says to Delores in the train that he had discovered himself and something along the lines of him belonging here in WW to be able to freely express himself than out in the real world.
So what I believed happened is he went along with Delores on the quest to the maze and eventually transcended into system. I believe the maze is where you AI and human consciousness transcend and become one.
Then something happens (maybe the catastrophic incident) which resulted in Delores not being able to join William in the maze.
Logan probably got away from his sticky situation where he got captured and realizes that he had lost William for good and been coming in to the park for 30 odd years to figure out / he decided to buy out the park. He later on figures out about the maze and is on a quest to find out what made William take such a decision.
Let me know.