Moed Katan 17: Excommunicated for Life (and then some)

[Who's Who: R. Yehuda bar Yehezkel.] How should the sages handles an excommunicated Torah scholar who was out of line in what must have been a serious way, where the sage who headed up the excommunication is no longer available to walk it back? Take it to the next greatest sage, even if you have to travel to do so. Though he delegated the investigation, and the sub's conclusion was rejected in the end. Also, haircuts on Chol HaMoed - for example, keeping the count of the mourner, and how the days of mourning fall out on the calendar.