I'm down to the last couple of episodes in Season 5, and I think I figured something out. This is not a confirmed spoiler about the upcoming season, but if you have yet to watch up to this point, it could spoil plenty and will probably make very little sense. Also, why would you be interested in this thread? Anyway, here goes: I think the reason Sun didn't go back in time is because she's the only one that was "supposed to" leave the island. If she'd stayed for the rest of her pregnancy, she would've died, and therefore she wouldn't have had any role in the island's events. The rest of the Oceanic 6 were sent back in time to join the other Losties because it's where they would've been if they hadn't left the island. This reinforces the "What Happened, Happened" Theory, in that they had always played a pivotal role in the Dharma incidents, though they wouldn't have realized it. It would've been crucial for all of the players to arrive when they did to ensure that certain events played out the way they already had once before. We're led to assume that this is to avoid a destructive paradox, but Farraday realized at the last moment that this wasn't the case. In the episode where Little Ben was dying, we saw several of the Oceanic 6 make pivotal decisions that would inadvertently and inexorably lead to cementing Ben's corruption. Their free will, ironically, was being influenced by what they thought they knew of what was going to (or had already) happened.
We would eventually see that the seemingly-resurrected John Locke was really the one responsible for convincing everyone that it was necessary for all the players to return and ensure that certain events would happen, and he even told the Old John Locke (by way of Richard) that he had to die, so that he could replace him. It's not destiny, but his agenda.
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