Chalcedon had full episcopal reception, including from the Alexandrine synod. This is why the Non Chalcedonians today all stemp from John of Tella and Jacob Bar Addai almost 100 years after Chalcedon, who made an entirely new line of episcopal succession.so, how do you deal with Chalcedon? because canonical bishops, to include canonical patriarchs of Alexandria, Antioch, and Jerusalem would reject it or accept it depending on who was enthroned. did it go from being ecumenical to not ecumenical until the schism?
how do you deal with our Constantinople IV, which everyone accepted and was called the 8th Ecumenical Council by East and West for over a century before Rome changed her mind?
plus, the example you gave was from when Rome was in the Church. nowhere does your quote say anything if a See departs the Church.
In other words, they are nakedly schismatics with a whole new line of bishops. The original line, our own, accepted Chalcedon. mainstream scholarship recognizes this BTW (Yonatan Moss, WHM Frend, for example).
As for what occurs when Rome departs the Church, indeed Nicea 2 does not specify. And so, without any other definition for an ecumenical council with wide acceptance from the fathers, i do not see how we can specify otherwise. However, we have had no lack of authoritative pan-orthodox councils outside of the ecumenical councils.
It may help if you watch that video above.
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