I'm more concerned about the book. It seems that at least Morgan can't use it. Unless there is a trick to ending the flashlight mode. But I fear that only Maynard can use this artifact. And I don't like that idea.
I doubt that Thatch - should he return - will turn on Aly. The fact that she lost her powers after striking against him might even make it easier to convince her to help his cause. Easier than convincing Autumn at least. While she might start to distrust Aly I doubt that she is inclined to listen to the guy who slaughtered her family.
But whatever plans our protagonists might have, in the near future I foresee a great battle. We will see how their price can help them there.