To give a background for the controversy, a typical argument against mainstream sedevacantism is that this long of a sede vacante period would result in the defection of the Church and a violation of the dogma that St. Peter would have "perpetual successors". Since time itself cannot be the primary consideration, the question becomes one of a moral / authoritative / juridical continuity. One response is that this continuity has not been broken due to the Pius XII-appointed bishops who are still living. Some find this inadequate. Others find it unnecessary in terms of maintaining the continuity. Sedeprivationism is one answer. I have argued that this lineage could possibly persist in the Eastern Rites because the can validly/juridically appoint bishops on their own, without prior papal mandate, and that the Pope usually has a veto power after the fact, but is not an a priori prerequisite for exercising jurisdiction in the Eastern Churches. In addition, it's quite possible / probable that Bishop Thuc maintained an Apostolic Mandate from Pius XII that gave him the authority to consecrate bishops as he saw fit.