Board Thread:Naruto Discussions/@comment-31278419-20170915213819/@comment-33156423-20170923232144

I think none of them were actually supposed to be teachers, they were head or captain of their teams, the students are supposed to learn their shits in academy, this is a military styled world, the leaders mostly help them co operate as a team, show them their weakness and guide them to their missions and also render help from them in bigger missions. This is why Shino is a teacher, while Konohamaru is a captain of the cell.

And once they are chunin they are all by themselves, they don't have to operate as a team unless they want to.