Dungeon King
yeah, it seems that everyone is only focusing on his negative talent and completely disregarding his positive one, they know what it is, it's on file, the school should and the principal should clearly be able to see that he's entered lots of dungeons and therefore has that many additional positive talents therefore being completely reasonable to expect that level of growth even if they don't know the additional talents, because if you have a guy with over 15 or so additional positive talents you would expect them to be op even if they don't get access to specific class features, that talent is literally a unique class on it's own that means you best adapt to deal with the dungeons