I repeat what I said about DL's objection: you're rejecting the theory, fine. But you are not falsifying the theory on its own terms, which would be checkmate. This is merely a rejection of the theory for reasons extraneous to the reasons it's based on: the election by the cardinals and universal acceptance by the ordinaries.
How does
cuм ex not implicitly falsify it, with the statement that if the Roman Pontiff were accepted and given obedience by ALL (including the Cardinals, explicitly called out), he would still not be endowed with papal authority? That includes the "Cardinals and Ordinaries".
It's also falsified by historical situations that I mentioned (I think one of them was a Pope Martin and another a Pope Stephen).
Given that it's a speculative theological conclusion, that's precisely the weight that it has.
On the other hand, the fact that the Magisterium cannot be stained in any way with error has been taught repeatedly by the Papal Magisterium. So there is that, which somehow R&R simply ignore ... because it doesn't really square with the narrative.