Why just Catholic for Rome and Orthodox for Constantinople but nothing for Antioch, Jerusalem or Alexandria?

**My context** : I am totally ignorant. LOL. Michael L Brown said > Just as most Christians are almost totally ignorant of what real Muslims believe, so also most Jews are almost totally ignorant of what real followers of Jesus believe. So Orthodoxen are ignorant of what Catholics believe, Catholics are ignorant of what Orthodoxen believe, etc. Please ELI5, don't judge me, etc. In Catholic schools I went to, I learned about Catholic vs Protestant stuff like sola scriptura, sola fide, etc and even about Eastern Catholic , but I'm fairly certainly our teachers didn't teach us about the existence of the Orthodox Church. Idk. I didn't even know about filioque. --- Based on 2:32 or 4:55 in Why Christianity Is So Divided - January 11, 2025 by Versedyoutube (channel ID ) and on my previous question https://christianity.stackexchange.com/questions/105402/list-of-jewish-ecumenical-patriarchs-of-constantinople (Perhaps my question is wrong because I don't even understand the 2 seemingly conflicting answers) : I notice the East-West split was and still is just Catholic (Rome) vs Eastern Orthodox (Constantinople) and not anything else for Antioch, Jerusalem or Alexandria. Why'd Constantinople, Antioch, Jerusalem & Alexandria break away from Rome but then the 4 of them united under Constantinople and are still united even to today instead of like a separate 3rd 4th & 5th things for Antioch, Jerusalem & Alexandria? The ff is afaiu : 1. The 4 Eastern bishops didn't mind Rome to rule over them as long as Rome ruled in a 'primus inter pares' way, not a primacy way. 2. The 4 Eastern bishops just then picked Constantinople to replace Rome. 3. Since then Antioch, Jerusalem & Alexandria have no beef whatsoever with the 'primus inter pares' way that Constantinople rules over them.