Also totally wrong! For that to be true would definitely count as Pilar being used against her Lord, since Cayden Cailean would be more reluctant to set those disasters in motion, if Pilar wasn't there to stop them.
It wouldn't be playing nice with Broom's god either, to set a disaster in motion, and then invoke the importance of Broom's god to stop that disaster while also doing something else you wanted. Other gods would be unhappy with Cayden Cailean about that; Cayden Cailean couldn't get away with that sort of thing the way Asmodeus can.
Aspexia Rugatonn's clever suspicion was in fact a pretty silly one! Any god would've seen that right away. Aspexia Rugatonn should remember that she isn't actually very good at this kind of reasoning, just better than everyone else around her except Keltham.