While I agree that he's not the smartest, I do believe he's supposed one of the smart ones (in my opinion at least). Maybe not school smarts, but some of his insights and ways of thinking along with his daydreaming habits tells me he puts a lot of thought into what he does. He doesn't always necessarily act on them, or think about consequences too much, but he does at least think about them. To me that seems like he has the capability, but who knows lol maybe I'm not that smart either 😅