You have to read pre Vatican II theology manuals and the old Catholic encyclopedia. Indefectibility is attached to the pope. He is the reason the see of Rome cannot defect. The only way the identity of the pope is not a dogmatic fact is when there are two or more possible popes like from 2013-2022. We have to make all the numbers given to us by scripture as symbolic much like Protestants do when they tell about a great apostasy. With Benevacantism everything fits. The Church founded on the pope cannot defect but the Church founded on an antipope can . The abomination of desolation is going to come very soon, then Christ will return to destroy the antichrist.