While writing Season 6, when did Darlton decide that the ALT timeline was going to be the afterlife? (poll 3407816)

While writing Season 6, when did Darlton decide that the ALT timeline was going to be the afterlife?

It was the plan all along

Around the Season 6 premere, "LA X", when the ALT timeline was introduced

A few episodes into Season 6, possibly after realizing the flash sideways weren't working

Around "Ab Aeterno", which contained teasers about the Island being purgatory

Around "Happily Ever After", when ALT Desmond started "remembering" the original timeline

During the final episodes of Season 6, when they started planning the endgame of Lost

Not until "The End", when they decided to throw it out there as a final, last-minute twist

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