He IS supposed to judge, his interpretation is supposed to be final.
Well, that idea began, I believe, with the very biblical concept of authority of church leaders to speak according to the Holy Spirit. If the Holy Spirit says to call someone on sin and prescribe a course of action, you call someone on sin and prescribe a course of action. But of course obedience to the Holy Spirit is needed to exercise the authority. And that’s on a person by person and situation by situation basis and it can’t be institutionalized to an office in the Christian church.