On the 3 courts identified in the previous mishnah: delving into the dispute between the courts and the individual who is being questioned as a possible rebellious elder. With the prime example of Akavya ben Mehallalel -- who is NOT deemed a rebellious elder. He had a tradition and an opinion that counters the majority, but is a regular dispute, as far as that goes. Plus, initially, the disputes were really kept to a minimum. Which leads into the rabbinic era and the proliferation of dispute among the students of Hillel and Shammai. Also, how perverting the Torah's teaching might actually prevent one from becoming a rebellious elder.