Season Five Theory
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Daniel will lead the nonhippies to the orchard where he will send them all (including himself) to the present (thus, meeting everyone and Sun and Jin will reunite). This will then end the season in a climactic ending with Desmond coming back to the island with Penny and Charlie Hume. Somehow, Desmond will regain a super magical powers and aid his friends to victory (meaning home, like the end of season four).