Ive been chewing on this for a minute
I dont think that the insinuation from Einfasen was that Azune is one of theirs. I think Otto's insinuation, especially because he says something like "we'd be lucky if you were one of ours" is that Azune is a sorcerer from a Sundered House. But not one we've seen yet. One of the lost ones that died out in the Shaper's War. And that Otto thinks someone needs to figure out which lost heir to a destroyed Sundered House he's found.
I think they wish he was theirs. And they know he isn't.

















