They talked about it in a video last offseason I think; McDermott and Beane hashing things out in a room between themselves and/or other concerned parties.
There must be situations where one side "wins" but the only one with the official "final say" is Pegula, if it ever even came to that. I doubt either guy is ever pulling rank over the other. Each believes in the same process of coming to the logical conclusion as a leadership group.