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Theory 1: After Aelle and Neville transcended time and space, they decided to drop in on the Arcus Prima ten years or whatever in the future, just to say goodbye before finally becoming all...transcendy.

Theory 2: The "other world" the high priestess keeps referring to is actually Earth, which they found when they used the Emerald Rimaajon to open a wormhole. They came back years later for reasons unknown, possibly to tell the Simulacrum's citizens the good news or something, hence the happy dance.