That’s just it: we’re NOT saying that Constantinople was second to Rome. We’re saying that the Canon in question stated that Constaninople was SECOND, not EQUAL to Rome, and therefore Rome wasn’t protecting
itself in rejecting the Canon in question.
Constantinople was not second to Rome in ecclesiastical matters either. That idea flatly contradicts the pronouncements of Damasus and Leo,and the opinion of the Alexandrian clergymen.
As I said earlier, “Constantinople was always considered Second to Rome” should be read as meaning “the Canons in question always claimed Constantinople was second to Rome, not equal to it”.
And that claim,along with the claim of C. ranking next after Rome in ecclesiastical matters,was never ratified by Pope Damasus and Pope Leo,so it was an illegitimate claim of some clergymen of C.
We’re not arguing for the “Second Place” status of Constantinople (which is really immaterial to the point, and what’s more Mardukm is himself Coptic, i.e. Alexandrian, and would be the last person supporting Constantinople’s claim here

), but rather pointing out the real reasons why Rome argued against the Canon.
It isn’t immaterial to the thread,because the thread is entitled “Papal authority vis a vis an ecumenical council”.
Canon 28 is an example of the pope using his authority to render null and void a decision of an ecumenical council. And it was his ratification of the council that made it ecumenical. After he vetoed the canon,there was doubt among the clergymen in the East as to whether the other decisions of the council itself were ratified (and therefore binding). The Emporer advised the pope to send a letter to the bishops saying that the council had been ratified.
“I have willingly complied, therefore, with what the most clement emperor thought necessary by sending a letter (Ep. 114) to all brothers who were present at the Council of Chalcedon to show thereby that the decisions taken by our holy brothers concerning the tenets of the Faith were pleasing to me. My doing so was naturally on account of those who want the decisions of the Council to appear weak and dubious, as an occasion for cloaking their own perfidy,on the grounds that decisions were not ratified by assenting opinion of mine,whereas I did dispatch a letter.” (Pope Leo, Ep. 117.)
Canon 28 was not recognized by the Eastern churches for 6 centuries,and the Greek historians of the 6th century do not mention the canon.