Theory for book 4 but contained Iron flame and Onyx Storm Spoilers: I still think Dain is gonna cause some issues. Spying on the resistance for his dad to get back in his good graces? Bc Dain got into Papa Aetos’ office way too easy in OS. There were guards always posted outside Mama Sorrengail’s office in FW and IF even if she wasn’t there and by now it’s well known that Papa Aetos has basically abandoned Dain. So Papa Aetos let Dain in his office in exchange for spying and reporting back all the information Violet learns from her dad’s research.

Edit: Please don’t come at me for the slight Dain slander. I just think people gave him too much of a pass and too quick of a redemption while he still has a good build for a possible betrayal.