That's an interesting observation. This hasn't been my experience. I think it may partially also just be misunderstanding, though. There are obviously more than

That's an interesting observation. This hasn't been my experience. I think it may partially also just be misunderstanding, though. There are obviously more than just 2 groups of students: those that get it with no studying and those that struggle with the material. I'll agree with you that the top part of the distribution that "just get it" are not going to be the best teachers. But, I doubt the bottom portion are either. Rather, students in the middle, who struggled to understand the material, but ultimately came to a good understanding are the best group. Granted, I'm just speculating and leaning on my own experiences. So, I really am interested to hear otherwise.