So I have this idea. I believe that the list referenced in previous seasons was due to the people on it were the ones that were meant to go back in time to do something (the incedent) or prevent something (the purge). The reason I know this was because Jacob was the one that made the list and he has been there during the seventy's and present day and would have known they were going to be there. I also have a contenuity gripe. If the island is always moving how when the group that time traveled went back in time did they not land in the ocean and if its because they were tied to the island then how did they keep from time traveling into a tree that hadn't grown there yet or in a random animal ala "The Fly" or smack dab in the middle of smokie chilling in the woods.