An investigative journalist I like, Larisa Alexandrovna, writes on her blog at-Largely the most compelling theory I've read so far (other than my own) about what the LOST story is about and where it's going. She's linked on this latest post to her overall theory which is dense with science. As we found out with RDM's Battlestar Galactica reboot, so much of what seemed carefully crafted story threads during a show's run do not necessarily ever get woven together into an elegant tapestry which creates a stunning and fully realized picture of what we are supposed to understand.
I think Alexandrovna is giving the show's creators/writers too much credit. In television you never know how many years you'll get to tell your story nor if certain actors will leave the show, etc ... it is a fluid process making a television show and such a dense and richly complex theory as she has laid out seems to me to be beyond the original vision of the show's creators. If they end up there, I think it will be more through creative mental gymnastics to tie the loose threads together masterfully with what they've dangled up to now than by design. The number sequence and the importance of the Valenzetti Equation are at the heart of the mystery and Alexdrovna has come around to my way of thinking that the key is Jacob seeking his replacement.
Alexandrovna discovered through TiVo rewinds that there is a name which corresponds to one of the shows key numbers, 108. Lighthouse reflector glass rotated around a marked circumference - and at numerical marks it showed reflected images of the pasts of various show characters. Mark 108's name is Wallace ... which gave me a knot in my stomach. Remember when Daniel was referenced on BSG at the end of Season 4? Daniel turned out to be merely a word - a writer's trick used to provide backstory - a really really cheap out. We never saw Daniel, he didn't matter, we only know he was "sensitive" because we were told that, and that's all we knew. Introducing a pivotal character late in Act III is a cardinal no-no in screenwriting. If this Wallace appears and is important then LOST is taking the easy way.
The cave markings and lighthouse let us know which numbers belong to which characters and the lower the number, the seemingly more important. The numbers are also Hurley's winning lottery ticket numbers, so clearly he is a fulcrum upon which the story pivots. He's remained alive, fat, and healthy and can see Jacob.
42: Sun /Jin ?
There is only one prime number among them, and that is Jack's number 23. Not only because he's the ostensible star of the show but also because of the prime (as I guessed earlier) of course Jack is Jacob's replacement. Other logical conclusions we can draw is that odd numbered people get killed first or are do not cut it as candidates, as only Jack's number and Sawyer's number are odd and not yet crossed out. This new realization causes me to amend my earlier view that Kate would be the last candidate, now I think it is Sawyer - for the dark side with Smoke Monster/Locke. If the show is to be about a balance of power between good/evil - dark/light - black rock/white rock ... then probably Sawyer will be Jack's counterpart at the end.
Why the island has its strange properties presents the chicken-or-the-egg conundrum for the writers: did human endeavor alter reality and manifest at the island or was the island always a living thing that drew its desired humans to it for its own ends? That now is the more interesting question for me.