The Canon Law issue is that the pope has immediate and ordiary jurisdiction in the whole church. Technically, it’s supremacy.
Taking the EO view as the furthest a Catholic could go:
In EO-style primacy, no bishop has any authority over another bishop as an individual, and sometimes may excercise the synod’s authority in extremis, and may call the synod, presides in and may break ties within the synod.
In Roman style “primacy,” a primatial bishop (on any level) may regulate the actions of his suffragan bishops. The concept of an Archdiocesan Synod is almost alien; the archbishop (or in 4 cases, Patriarch), while he can’t remove a suffragan, can discipline his suffragans, and has limited ordinary authority.
Papal Supremacy essentially amounts to “The Pope is Archpatriarch to the patriarchs and archbishops, in the same way that an archbishop is to his suffragan and auxiliary bishops.” As in, he can replace, retire, appoint, transfer, create, or abey any bishop. It is also part and parcel of the Roman model.
Papal primacy, in the east, follows BOTH models.
Within the Metropolitan Churches, like the Ruthenians, our synod acts as a group, with the metropolitan as its head. But our synod does not elect its primate, the metropolitan. They elect three candidates, and the Pope chooses and installs one.
In the Major Archiepiscopal churches, the Major Archbishop appoints, relieves, transfers, and ordains bishops (and archbishops) by whatever the tradition is within that church; creating and abeying bishoprics is still papal. The Marjor Archiepiscopal Synod elects one candidate, whom Rome then Approves.
In the Patriarchal Churches, the Patriarchal Synod has all the powers of a Major Archiepiscopal church’s, plus the ability to create and abey bishoprics, and to elect their own primate/patriarch/catholicos. His first act is supposed to be requesting union with Rome.
In All cases, the roman supremacy means the Pope can relieve any bishop, since he has ordinary jurisdiction in all Catholic churches, and has supremacy over all bishops. That he doesn’t do so is a good thing, but he could.
Now, by comparison, the EO view is that no primate can excercise more than the following authority over another bishop:
- To call them to the synod.
- to set the order of consideration at the synod
- to break ties in the synod
- to act in the name of the synod in the short term, but subject to ratification or reversal by the whole of the synod.
The EO vest all power in the Synod, not the Primate.
The Romans vest almost all power in the primate, not the synod.
Most of the EC’s tend to be closer to the EO within their church, but acknowledge the Supremacy of ONE bishop: the pope.