A.N. Not my theory
In Alluvettere when Keefe had the fathomlethe one of the notes he scribbled was "Why did she make them test me twice to see if I manifested as a conjuror?" This could mean Keefe is going to manifest as a conjurer. He probably won't just be a normal conjure though, there will probably be some enhancements made to the ability. Things such as being able to teleport people and not having to know where they are, if the ability was really powerful the objects might not even have to exist, he could make a whole house from scratch, or a shield.