Ives' sanity
I'm wondering; When Colqhoun/Ives starts acting like a mad animal at the cave, is that his true self coming out or is he doing it as some sort of psychological ploy? Later in his Ives persona he acts completely human and rational. EVIL, but human.
I don't think someone that crazy would be able to pose as a smooth manipulator, but I don't see the point in the feral wildman act.