I think that Lost was simply the story of Jack and his experience within and through the 4th, 5th and 6th Bardo. He is the only true or real character in the story. He is trying to come to terms with dying, being dead and trans migrating to the next dimension or afterlife. REMEMBER the writers said they wanted to kill Jack off in the 1st episode !?! Maybe thay did just that. The island is empty - BLANK PAGES -jack imagines it all - People. Giant birds. Time machines etc. He fills in the pages with his imagination or through the influence of his "friends" which manifest themselves on the island. REMEMBER. "Somewhere on the island is a large box and whatever you imagined, whatever you wanted, would be inside that box" eg. Hurley has a comic book with a polar bear in it - next thing you know HEY PRESTO there are polar bears on the island! eg. Junkie rock star- plane load of drugs. Can you think of other examples?