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Another question (so this won't all be philosophy and ethics): Who saves the rest of the Whorl? Horn's appendix makes it clear that people from cities other than Viron made it to Blue. Who got them there? Did the Outsider enlighten someone in each city? Auk's lander is the first to leave the Whorl. What's happening elsewhere? Why did Tartaros pick Auk of Viron, of all the Cargo? (That at least has a plausible explanation.)
Here are my answers to Dave's questions, last first. Tartaros picked Auk, I think, simply because he could, given his limitations. After he created the Pas puppet to speak for him, he could have it appear on screens and manteions throughout the Whorl, and that's just what I think he did, which answers the earlier questions. I find it sort of unlikely that the Outsider is involved since the Outsider's message, in neither case, seemed to involve actually leaving (at least Silk didn't see it that way, though in the interesting discussion above, it's been established that Silk is sometimes wrong). Tartaros has the Fliers working for him to spread the word too. Tartaros is an intriguing guy/god and it remains to be seen if he's good (working for mankind) or evil (working for the inhumi to set up a great big picnic). The real Pas, I'm convinced, was a nogoodnik, and it's debatable whether the Whorl is a legitimate colony ship.
-algae- (I concede the "alga" question, but it looks too odd; algae seems humorous)
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