Out of all the theories, I have read, I think the time-loop theory fits best. Although the writers have dismissed time travel, this is slightly different. I also agree with cable runner that things have moved on from series 1 and Lost has evolved into something more than it ever meant to be. Ie Jack was supposed to die early on and Ben was only a bit part when it was first conceived.

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Baby I am tied to a tree in a jungle of mystery. I just got tortured by a damned spinal surgeon and a genuine Iraqi. 'Course I'm serious.