I'm pretty sure it was meant to be closure for them all. As Christian said, "This is the place you ALL created." It wasn't just Jack's closure, it was everyone's. We saw everything through Jack's point of view, in a sense, and in the end he was the missing piece of the puzzle to allow everyone's spirit to move on, but the flash sideways were not just for Jack. It was a "reality/world" created by all of the Losties in order for them to move on as a group. Sawyer and Juliet needed closer, Kate needed to make things right with Claire, Desmond and Hurley were the "special" members who had to be the catalysts for everyone else to remember, Sun and Jin needed to be reminded that even though they were dead their daughter was perfectly healthy in the real world, Locke needed to be saved and end up happy with Helen, Sayid and Shannon (ugh to the relationship, but Shannon and Boone's return scene with Hurley/Sayid was done perfectly to me) needed to heal each other once again.
That's how I viewed it, at least. They had all remembered, they had all been ready to move on, but in order to do that this specific group needed Jack to save them all once again and remember so he could let go, which was Juxtaposed with him saving the Island and finally reaching his "purpose" on the Island.
Comment