Thanks for your reply/ There are several problems here, all stemming from a misunderstanding of the Catholic Church’s teaching on “papal” infallibility:
(1) The Church’s dogma on “papal” infallibility does not say that he cannot be a heretic or cannot teach heresy. Rather, it asserts that he cannot proclaim and impose it as the Faith of the entire Church. The dogma of “papal” infallibility, contrary to the misunderstanding of many non-Catholics (and also Absolutist Petrine advocates) is not a positive protection of the Pope’s person. Rather, it is a negative protection (i.e., a preventive) for the positive protection of the Church. The Church is the focus here, not the Pope alone.
(2) Papal infallibility is not inspiration nor revelation. It certainly does not claim that an ex cathedra teaching is magically enforced by the Holy Spirit so that everyone understands it immediately. Nor does it magically prevent a Pope from expressing God’s Truth in a way that others may misunderstand. Even the biblical writers with the charism of inspiration had full freedom to express themselves according to their personal and cultural styles. If Westerns/Easterns innocently misunderstood what each other meant because of theological/linguistic differences, that is certainly no indication that papal infallibility did not exist. In fact, recent talks have exposed this misunderstanding of centuries past between Easterns, Orientals and Westerns. And the path to reunion through understanding is slowly being paved.
(3) The doctrine of papal infallibility does not claim that an ex cathedra teaching should be accepted blindly. It merely states that under certain conditions and specific circumstances, the Pope will be graced by the infallibility of the Church in order to speak to and for the Church on a matter of faith/morals.
To refute the dogma of “papal” infallibility, evidence of conscientious disagreement is an irrelevant and invalid approach. What one needs to do is give evidence that the Pope has actually taught as the Faith of the entire Church to be believed by all, a particular teaching that OBJECTIVELY contradicts the Sacred Tradition of the Church. If you feel there is such a case, please present the evidence here.
As noted in my previous post, no one is bound to follow anyone, even a Pope, into heresy. If Easterns conscientiously (though inadvertently, due to insurmountable differences in language and theological perspectives at that time) did not follow the Pope, then that has no bearing against papal primacy and universal jurisdiction.
Please consider also that you might be viewing papal primacy and universal jurisdiction through the lens of the Absolutist Petrine distortions of the CC’s actual teaching on the matter.
Blessings