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So we know Tabini isn't putting Bren somewhere safe while he wrecks Mospheira; it wouldn't make sense to do it out of fondness, and if he's planning on wrecking Mospheira, why would he need a paidhi?
On the other hand...
[spoiler]
The office of 'paidhi' predated humanity; it was an emissary from one lord to another, who would negotiate on his lord's behalf but also try to act in the foreign lord's interest as well. Since Bren is clearly pretty good at being a human-atevi paidhi, it's not impossible that Tabini would have wanted to use him as a paidhi to another lord, especially since, as a human, he would be obviously completely neutral.
Spoiler for the most recent book in the series:
Date: 2011-06-15 09:45 pm (UTC)On the other hand...
[spoiler]
The office of 'paidhi' predated humanity; it was an emissary from one lord to another, who would negotiate on his lord's behalf but also try to act in the foreign lord's interest as well. Since Bren is clearly pretty good at being a human-atevi paidhi, it's not impossible that Tabini would have wanted to use him as a paidhi to another lord, especially since, as a human, he would be obviously completely neutral.
[end spoiler]