Since there are both Eastern Orthodox and Catholic churches, and each has its own patriarch, who would be the true one?
The one with a single point of unity that removes any pretext for schism.
I’m surprised a Catholic would endorse the Orthodox Church like that.
Note from Moderator:
Now I invoke the Debate Guidelines for Eastern Catholicism.
May God Bless You Abundantly,
Eastern Catholicism Moderator
Don’t be so shocked!
As for the OP, not all Eastern Catholics exist under a Patriarchate.
Further, the age old question of (or rather, default mindset around) territoriality will inevitably short-circuit thinking along these lines before that question arises. Just look at how poorly we deal with ECs now in the diaspora that are not part of a Patriarchiate (or a “Patriarchiate lite”, otherwise known as a Major Archiepiscopate, which only exists under the unspoken pretense that Rome does not want to compound the problem of multiple claims to Patriarchial sees). Once we are viewed as a people and not as a territory, these simply become questions of optimal leadership for particular churches of same or most common origin.
A great Eastern Catholic leader once said that it is our destiny to become obsolete.
Until recently, I didn’t think that was such a sound idea.
I now believe this is the only path to reunification of the Apostolic Churches, in which case the question in the OP is relevant, but sadly a distant consideration (or so it seems at the moment).