I’m not arguing for R and R, or really anything in particular. But I don’t see how the great western schism applies here. With the great western schism, there was a real disagreement among the faithful about WHO the pope is. Whereas in this case, Sedes AND R and R are kinda numerically insignificant, and none of them have an alternative claimant. I get that the situation is a mess and we can look at it and plainly see it’s a mess, but I don’t understand the LOGIC of how that beats universal acceptnace
But these Popes aren't universally accepted, now are they? Or do sedevacantists not count? As Fr. Cekada said, "what are we? Chopped liver?"
As for the Schism. It does apply insofar as it is the only other time in history where there was utter confusion about who the Pope was and who to follow. In this situation, many believe these claimants to be Pope, but the fact of their clearly manifest heresies have led to the question of legitimacy rather than identity. Hence why there are two more prominent camps on how to address this problem. It is the most confusing situation in Church history.
There's also the example of Pope Liberius, who was believed to have fallen into heresy. This led the faithful to elect Antipope Felix II, but this withdrawal from universal acceptance of Liberius did not delegitimize his claim to be Pope.