Another thought.. (yeah… after many years I am rewatching the show and its still brilliant but some things come up in my head).
So Locke blows up the sub and everybody is devastated because now we cant leave the island. Well, everybody but Ben and John Locke that is ;)
Among them are Jack and Juliette. Devastated because they were about to leave but now they cant.
I wonder why as at least Jack has seen Walt and Michael leave in a boat mere days before the explosion of the sub. So… he forgot about that?????? Or are we dealing with a bit of a loophole?