Maechen and the black mage dressphere (possible spoilers)

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EDIT: Well, since the title of the thread mentions possible spoilers, I'll leave them off from now on.

EDIT2: Except for Chapters 4 and 5.

No, unsent could persist so long as they weren't part of the collective dream of the Fayth on Mt. Gagazet. Once the Fayth woke up, they vanished from Spira, as did their dream (DZ) and all its inhabitants (including Tidus).

(SPOILER)In FFX-2, the Fayth of the Aeons get dragged onto the Farplane and enslaved by Shuyin. Once freed, they can reconstitute Tidus. The game sidesteps the issue of what happens to the rest of the population of DZ.

And I wasn't suggesting that Lenne was from DZ, although the view we see through the sphere looks a lot like the architecture of DZ. It shouldn't be surprising since the real Zanarkand influenced DZ. However, the image in the sphere doesn't match the Zanarkand Ruins we see in FFX and FFX-2.