When the Buddha was asked who his Dhamma heir was, he didn’t appoint one. Instead, he left the Dhamma-Vinaya. The Dhamma is something that the laypeople hear a lot about. The Vinaya seems to be something that is the domain of the monastics because it’s the rule that we live by. As bhikkhus, we all adhere to, surrender to, and venerate that. No seniour bhikkhu can override the Vinaya.