For example, and I have nobody in mind, but were Pius XII to have consecrated someone in pectore behind the Iron Curtain, then later that bishop rejected Vatican II and himself consecrated other successors in pectore, and imparted office to them, then the "lone bishop in the woods" theory is not as absurd as its made out to be.
The grand question is: Can office be transmitted in pectore by another bishop, Rome being unadvised?
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I think those bishops were sacramental functionaries whose job it was to administer confirmation or maybe Holy Orders. I don't think they were the ordinaries of dioceses. There's an inherent problem in having the bishop of a diocese whose identity is secret, which is that people are obliged to obey the bishop of a diocese, and they can't obey him if they don't know who he is. Now, certainly there have been bishops with ordinary jurisdiction who went into hiding to evade persecution, but that's not the same thing. In that case, everyone knew who they were, they just didn't know
where they were (especially not the persecutors).
But you have a real problem if no one knows even the identity or name of a person who has ordinary jurisdiction. That's basically a scenario in which someone walks into town and says, "I'm the bishop of this place, I have authority over this diocese," and no one has ever heard of him before or was notified by the pope of his appointment. Would anyone accept him? Of course not. Nor should they. Then, if he produced some docuмent supposedly from the pope, how would anyone know this was not a forgery?
The problem here is that the whole concept of appointing someone to public office, by its very nature, is a public act by a superior authority, and it isn't possible to confer that authority secretly without removing at the same time any obligation of people to obey him.
consecrated someone in pectore behind the Iron Curtain, then later that bishop rejected Vatican II and himself consecrated other successors in pectore, and imparted office to them
This problem is becoming even further compounded in this scenario, in which such a person secretly appointed to office is now dead and gone, and someone comes along claiming that someone whom nobody ever knew was a bishop has subsequently turned around and made
him a bishop, so that he now has authority over the Church.
I understand people trying to find a way to trace authority back to pre-Vatican 2 times, on the supposition that it has been lost somehow unless we can do that (an idea I disagree with), but honestly this scenario has serious problems on multiple levels.