What if Jacob and the MIB are two halves of Aaron's personality?
Let's say Aaron in the future tries to get back to the island to find Claire, Kate, and the others but the trip to the island
went wrong in two ways: it sent him far in the island's past and it split him into two different people. One was Jacob, who posssessed the positive of Aaron's abilities, who reached out to people through the better angels of their nature, who carried the most positive of Aaron's memories. The other was the MIB, who possess the negative and offensive of Aaron's abilities, who reaches out to people through the weaknesses of their narture, who carries the most negative of Aaron's abilities like for example Claire's craziness and the problems he gone through as a result of that. Maybe that's why he told Kate in the form of Claire not to take baby Aaron to the island because if baby Aaron encounters crazy Claire, that Aaron's life would have unfolded the same way the same way as the MIB Aaron's life did which is the last thing he wants.
Let's say Aaron in the future tries to get back to the island to find Claire, Kate, and the others but the trip to the island
went wrong in two ways: it sent him far in the island's past and it split him into two different people. One was Jacob, who posssessed the positive of Aaron's abilities, who reached out to people through the better angels of their nature, who carried the most positive of Aaron's memories. The other was the MIB, who possess the negative and offensive of Aaron's abilities, who reaches out to people through the weaknesses of their narture, who carries the most negative of Aaron's abilities like for example Claire's craziness and the problems he gone through as a result of that. Maybe that's why he told Kate in the form of Claire not to take baby Aaron to the island because if baby Aaron encounters crazy Claire, that Aaron's life would have unfolded the same way the same way as the MIB Aaron's life did which is the last thing he wants.