Dr. Clark weighed in a topic about which I posted yesterday. In this 600th anniversary year of the convening of the Council of Constance, his effort is very timely and can be read here.
The crux of the matter is put succinctly here:
The Avignon crisis is just one of many examples from the history of the medieval church that illustrate the futility of seeking continuity, unity, and stability where they have never existed. The historical truth is that the Roman communion is not an ancient church. She is a medieval church who consolidated her theology, piety, and practice during a twenty-year-long council in the sixteenth century (Trent). Her rituals, sacraments, canon law, and papacy are medieval. The unity and stability offered by Roman apologists are illusions—unless mutual and universal excommunication and attempted murder count as unity and stability. Crushing opponents and rewriting history to suit present needs is not unity. It is mythology.
I commend his post to your reading.