It’s an interesting theory. But the thing I don’t understand is that wasn’t Cardinal Siri a liberal in his later years that said the Novus Ordo Mass and recognized the other Conciliar papal claimants? Wouldn’t he be part of the same group of criminals that have hijacked the institution of the Church and as a consequence would have lost any formal authority?
Siri was not a "liberal". He called V2 the "greatest disaster in Church history". He was friends with Archbishop Lefebvre and part of the
Coetus Internationalis Patrum, and was always characterized by biographers as a "staunch conservative". So he was hardly a "liberal". Whatever errors he may have made in judgment were done in his capacity as a private person and not in exercising his office (which he did not do). No one has yet demonstrated any manifest heresy that Siri adhered to that would have rendered him a non-Catholic and therefore to have vacated the office ... because no such example exists. He could even have been mistaken in thinking that he resigned, not considering the fact that the resignation was illegal due to it having been under grave duress. Mere acquiescence to the NO "hierarchy" does not
ipso facto make someone a heretic.
Just imagine for a second that you're Siri. You are elected pope, accept, take the name Gregory XVII. Then a group of Cardinals come by hurling threats, perhaps it's to kill off all the bishops and priests behind the Iron curtain, perhaps it's to kill your entire extended family, perhaps to nuke the Vatican, and you give in, "Fine, I'll resign. Pick someone else." From your entirely subjective perspective, you resigned. But viewed objectively, by a third party, the resignation was not free but made under grave duress, therefore making it invalid/illegitimate.