I can understand where you are coming from but I see a difference between just teacher and a true Master. A True Master, a student will never surpass, unless the Master dies an untimely death. A true Master Masters himself, and he is living the way, he doesn't speak about the Way, he simply lives it. The student then just follows without being forced to follow. The student can surpass many teachers because anybody can be a teacher but the student can never surpass the Master. It's like trying to catch up in age to your own father, you can't, unless he dies an untimely death. But if he lives a long life till 100, you will never catch up, you might even die before him. He has experienced so much more than you in your life, he already walked the path that you are walking now, he knows the way, you are just trying to learn it.