One of the things you will find, which is interesting and people don’t think of it enough, with most businesses and with most individuals, life tends to snap you at your weakest link. So it isn’t the strongest link you’re looking for among the individuals in the room. It isn’t even the average strength of the chain. It’s the weakest link that causes the problem.
An exceedingly confident student would in theory make a terrible student. Why would he take school seriously when he feels that he can outwit his teachers?