I accept all the dogmas. Not just the ones that suit my beliefs. No Catholic ("sede") argues that the Roman Pontiff is the Pope and the successor of St. Peter. We just correctly believe that a heretic cannot be a Roman Pontiff. We also accept the dogma that St. Peter SHOULD have perpetual successors. However, you twist that dogma to mean "will have perpetual successors". Therefore you reject the true meaning of that dogma. Catholics also accept the dogma that heretics cannot even be members of the Catholic Church (no less a Roman Pontiff). You flat out reject that dogma. Catholics also accept the Catholic teaching that public heretics are GUILTY until proven innocent. You reject that teaching. Therefore Catholics (whom you call "sedes") actually hold all the dogmas above, whilst you only hold one. You pick and choose your dogmas and teachings, hence you are a heretic.
To be true, you cannot say that you "correctly" believe that a heretic cannot be the Roman Pontiff - that's *if* you want to speak correctly.
In order to be true, what you *can* say is that you conclude, opine, believe, judge, decide, surmise, extrapolate, figure, reckon or deduce etc., that a heretic cannot be the Roman Pontiff - that's *if* you want to speak correctly.
The Church teaches that heretics, having severed themselves from the Church, are not members of the Church. I get that, I most certainly get that. Heretics are most assuredly outside the of the Church, they have severed themselves from it and are likened to a dead branch that falls from the tree, lands on the ground and is no longer a member of that tree, a heretic is no longer a member of the Church. I agree, I get that, that is the teaching of the Church and I wholly accept and believe it because that is the teaching of the Church.
What you need to do is provide an authoritative teaching of the Church, teaching just as specifically worded as the dogmas, that it is the official position of the Church that a heretical pope loses his office and/or whose election is/was null.
This is an absolute must. We have got to see how the Church authoritatively explains how Her Body lives with it's head severed off. Without this, we remain bound to the dogmas.
I obviously do not expect you to produce such a teaching, because there is no such teaching, yet in order for us to say we accept all dogmas, on account of the dogmas and their preciseness, we must have the above requested teaching with that exact same preciseness if we are going to go around saying, as if it actually is a teaching of the Church, that the dogma does not apply to us in this crisis.
So basically, what we actually must have, is an official teaching of the Church authoritatively stating that the dogmas previously defined do not apply to anyone during the reign of heretical popes. Until then, we have no other choice, we are bound to the dogma infallibly decreeing that being subject to the pope remains a requirement for heaven, and the condemnation for saying the pope is not the pope remains the infallible teaching of the Church.