jack pulls his jesus act, causing the island reality to shift over to the sideways reality, and the big reveal is that they are all constants to the universe, they are just going to keep shifting from reality to reality and not remembering what happened in the last, each time will be a little different and there will be different "not-ready" transitional people left behind, but the core group will always remain the same and the task of protecting the island is the same for all realities, kind of bittersweet in that it's a bit of a curse but at least this once they were able to remember what happened before and they can move to the next reality knowing they may have to do it forever but they'll always have each other to rely on
/runon