< Of course no one else was at the ECUMENICAL council. >
The bishops of the council made sure that the papal legates weren’t around when thy concocted canon 28.
< READ the canon. It says nothing about jurisdiction over the Eastern churches outside of Thrace (which Constantinople was by then the metropolis), Asia (a embroyonic patriarchate that was never to be, wedged between Antioch and Rome, and then New Rome), and the Pontic/Barbarian areas (another embryonic patriarchate of Caesarea, absorbed into Constantinople rather than Antioch or her daughter Armenia). >
That’s the whole of the Eastern Mediterranean and Black Sea lands,and the barbarian tribes to the north of Geece. Asia was the Middle East and Arabia,and could even refer to Egypt and Libya. By claiming for themselves the “privileges” of Rome,they were claiming jurisdiction over all of the Eastern churches,because that is what the popes had always claimed. How else would you define “privileges of honor”?
Chalcedon and Trullo defined it in terms of ecclesiastical jurisdiction: Constantinople was to have the same privileges in ecclesiastical matters in the Eastern churches as Rome did.
In practice,the privileges in question amount to jurisdiction over other dioceses. Constantinople,“New Rome”,was trying to emulate the authority over the East that they acknowledged in Rome. There’s no other way to explain it.