About the risky soul swap plan, Ux would've preferred not to leave it to chance and gone with Sofie's plan of forced redemption instead.

About Pilot, I'm not sure Ux would've inquired much further than that. However, had the party uncovered Pilot's past, then Ux would've been in something of a quandary. I suppose he would've suggested that Pilot's long time as a slave would've served as enough of a punishment, and that we used Sofie's daily Wish to completely blank out the memory of Pilot from the minds of all the efreeti guys after him.

Ux would've kept his end of the bargain with the Dustmen. From here on, he'd have been confident the Dustmen would've meted out justice to an unhinged serial killer, that is, poor guy is not really responsible of what he did so must be mentally cured/physically restrained. In addition, finding out about all this and stopping the killing spree would've probably not prevented the ban on slavery to actually happen, all the more so that House Midai wasn't really pushing that hard against this prospect. Which pleases Ux.

So, yeah. Ux would've told Sofie about Teru, if only for the Book, would've tried helping Pilot go to ground without a direct confrontation with the City of Brass if possible, and would not have told Sofie about the Noctuary, since he trusts Delja more than her. Besides, he figures if gods themselves do not have the kind of power the Noctuary is supposed to provide, then it's best not to have that kind of information attract the attention of too many gods, and Amaunator is not entirely to the theological liking of Ux.

Besides, can we have Myriad turn into an NPC and be our Five Pebbles pilot?