The lead does not teach every session
That is the difficulty: they must know whether follow-up is holding, without sitting in every class. Organising a Quran school begins with clear groups, teachers who can hold the thread, and a history that does not depend on one person alone.
One structure, several views
The teacher sees the session. The learner sees the path. The parent, if access is open, sees a reading. The lead sees that nothing essential is lost from one group to another.
Darajet serves this organisation. It does not impose a pedagogical method on the school. It helps follow-up remain a shared good of the structure.