One thing that confuses me is Cranberry asking Fav about what happens when they lose their magic. By now it's established that the two are working together, probably have been for some time, and that Cranberry almost certainly knows the mechanics involved. So why did she ask if she should know? If it was in a public forum to make sure the others knew and were more willing to fight to the death that would be one thing, but she asked when there wasn't anyone else around, and guessing that Winterprison would trawl through the archives and find that conversation is implausible.