I am not sure which part of my post you were referring to, dzheremi, or what you want to address. I am sorry I do not get you.
Hi Reuben. Sorry I missed this earlier. I was addressing mainly point 2(b) and following, when you wrote:
(b) the Pope represents and guarantees the Church’s unity.
If the office of the Pope is the cause of schism then it is an objection to the foundation of the one source of unity within the Church which she requires for unity in the first place.
I merely wanted to present an alternative to the Pope-dominated ecclesiology of the RCC. And, really, I think calling it “Pope-dominated” might be taking to lightly. As per your points above, there essentially is no Church without the Pope, as the Pope guarnatees the Church’s unity. We in the Coptic Orthodox Church, which is the first Papal Church in the world, do not see things that way at all, and
we love our Pope (and your Pope, too; why not?). It is the Holy Spirit Who has preserved the unity of our Church, not to the exclusion of having a Pope, but certainly to the exclusion of placing such importance on him that without him the Church cannot be unified, or cannot be visibly identified as being so. In the past, of course (and here I mean also the recent past), there have been times when we have had to depose our own Pope precisely to preserve that very unity of faith, as Pope Yusab II had fallen victim to personal cadres who were given to simony and he proved too aged to be effective in fighting this disease. What keeps us together as a Church and a wider communion if our leaders (including Popes) are so fallible? The Holy Spirit. This is especially clear when you consider that not all the OO churches accepted the deposition of Pope Yusab II (the Ethiopians still don’t). But our ecclesiology does not spill over into our theology such that these kinds of situations are a threat to the unity of the Church, as they do not touch the common faith that we profess (as per the confession of faith found after the reading of the Pauline Epistle in the Agpeya; that’s the whole reason I brought that up, to make that same connection that the Agpeya itself makes be presenting one right after the other).
So, in that context, I do wonder: Where is the Holy Spirit in RC ecclesiology? If everything is guaranteed by the Pope, then does that mean that the Roman Catholic faith
en toto (including its Eastern compatriots) essentially amounts to a prescribed posture toward Rome? An Indian Orthodox acquaintance of mine recently remarked that the only true heresy in Rome’s eyes is ecclesiological. At first I thought he was being unfair, but the more I think about it and read what Latins themselves have to say about their church, the more it seems like there might be something to that. It is as though Rome is treated as the
panto-ekkelsia, by whom all things were made, and the Roman Pope likewise.
Of course I am likely misunderstanding what you mean when you say that the Pope guarantees the unity of the Church, or that the Papacy is “required for unity” and “the one source” of that unity, but…those are pretty extreme statements. It’s like the RCC is a big game of Jenga and the Pope is
literally all of the pieces. 
