Most who encounter Canthos are dumbfounded by him. He can immedeately appear as a bumbling fool, being very bouncy and easily distracted. It's easily just as possible that this is a ruse to literally confuse everyone into thinking he's dumb so that he can easily outwit them, it's impossible to tell. He has a tendancy to talk everyone in circles, constantly showboating and exagerating everything out of necisary preportion. All that reveals his underlying genius is his unfaltering resorcefulness for survival against all odds, as if he's planning every move he makes, every step of the way.