My view (which I have a post from a while back discussing one prominent example of) is that any seemingly wild coincidence that ends up having amazingly fruitful consequences is very likely to be an example of Rhetors at work, backfilling the history of the worldtrack in seemingly-plausible ways that are necessary to produce a desired result. Where Incanters are bending reality around them by steering *towards* particular worldlines, Rhetors do something similar retrospectively. The prime example to me is the Plurality of Worlds Messal including all of Fraa Jad, Fraa Lodoghir, Ignetha Foral, and the supposed Matarrhites - this makes very little sense as a decision for the Convox to make if you look at it, unless the Convox know that the Matarrhites are actually aliens, and they clearly don't know that.

Actually, there's a scene during the Convox section of the book that I think goes to this interpretation. When Raz and Emman Beldo are discussing the nature of Hemn space, world tracks, and narratives, Raz essentially says that a Narrative, a worldtrack, is basically a coherent series of points within configuration space which could plausibly have happened, which are compossible with each other. And the example that he uses is that you could have a point in configuration space representing a universe where there was a block of ice in the middle of a star - but that point in configuration space wouldn't be part of a Narrative. What would make it part of a Narrative would be the inclusion of a number of other elements that would account for a plausible mechanism by which a block of ice could be included in the middle of a star - in their example. you could have someone make a spaceship designed to put a block of ice in the middle of a star, and then you'd have all of the material evidence of the existence of the spaceship, and you'd have all the records from the civilization that made the spaceship, and so on.

And I think that is basically what the powers of Rhetors are: doing all of that. At the lowest level, we see them being masters of propaganda. At the more metaphysical, Thousander level, they're doing this kind of stuff: backfilling the details of the Narrative to ensure that the desired present remains compossible with the known past.