It could be. But it could also be that they all have the same potential of intelligence (roughly), and that it's just he's hit more of his potential than they h

It could be. But it could also be that they all have the same potential of intelligence (roughly), and that it's just he's hit more of his potential than they have, through utilizing and practicing the skills. Kind of like how my brother is better than me at basketball, but I could be as good as him if I actually tried.