Jorg's obsession with Katherine never made much sense. I get that he was pretty young, but in the first book he spent like an hour with her before everything went to hell, and all they fucking did was talk in a hallway and eat some food. There was just nothing there. In many ways the obsession reminds me of Kvothe and Denna from Kingkiller, but that I could at least understand.
Similarly, Jorg and Coddin. Suddenly in King of Thorns I'm to believe they have a great relationship, like father and son. What? I get four years have passed but Coddin was barely even a character. I couldn't feel a single thing during the scene where he gets injured.
And then there's Jorg's madness. This felt like a cheap way to manipulate the narrative by introducing the box than anything else. Jorg being sad that he accidentally killed his brother I could buy, him going batshit I couldn't.