If you go with a theory that everyone died when the H-Bomb went off, the rest of the season can be thought of as only existing to help Jack "Let Go"
It was his mistake that essentially killed everyone, so he has to "save" everyone by destroying the smoke monster, sacrifice himself, and leaving the island in safe hands (Hurley). On top of this his finally wins Kate's love back.
With all this finally complete he can let go and join the rest of the dead members in the church (Heaven).
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