Normally your posts are well thought out, but this one is not.
Don't know about well, but thanks for the kind words Father.
Border disputes are not the same as overlapping jurisdictions in whole countries. Furthermore, many of your other examples show zero example of overlapping jurisdiction. Alexandria did not and does not claim jurisdiction over the Sinai. The Sinai parishes in Cairo are spelled out as metochia. That Romania holds title of locum tenens of Caesarea-Cappadocia is irrelevant to the situation, as the title locum tenens is powerless when there is a local canonical hierarch in a local synod (and in any case, is an accidental title that got carried over generations after it was applicable). The rest of the situations are in states that have been in a turmoil of boundary wars and identity, particularly the instances connected with Serbia. That this effects regions does not decry cross jurisdictionalism throughout whole patriarchates. Again, border disputes are not the same thing as the toleration of overlapping jurisdictions throughout who countries.
It goes beyond border disputes. In the case of Serbia, Hungary, let alone Serbia, does not border the Czech Republic, yet, as I found out today, Serbia's Buda exarchate claims jurisdiction over it, and the rest of the territory of the autocephalous Czech-Slovak Church. I don't know the particulars: I do know that Mosocw gave a Tomos of Autocephaly in 1951, Constantinople continuing to claim it without basis until 1998, but I don't know of Serbia explicitely yielding jurisdiction.
Somewhere here we have a thread on the flareup between Romania and Serbia (a rarity, as they usually get along very well): the Serbs are used to for centuries being spread across several states, and the Romanians have been getting away from having other Churches owning their land (the metochia of Sinai and Jerusalem owned a third of the country before the Prince united the Metropolis of Moldavia and the Metropolis of Ungrovalahia and nationalized the foreign monastic holdings). It goes beyond a few miles along the border.
Would you characterize the fight of Bucharest and Moscow over the whole of the Republic of Moldova as a border dispute? The Metropolitan of Bessarabia claims all Moldovans throughout the jurisdicton of Moscow in Russia, Ukraine, etc. What of Estonai? Both Mosocw and Constantinople claim the whole country, a country where Orthodoxy is the largest religion and had an Orthodox Church in 1030. Briefly it split the Orthodox world in two.
As I said, Alexandria is the only area that has no real jurisdictional issues to speak of. I mention Sinai because it is the only real question: as I said it is autonmous, under Jerusalem, but Sinai has been ruled from Cairo for well over a millenium, and there the Pope of Alexandria plays the role that the Ecumenical Patriarch played/plays in Constantinople as head of the EO. Hence the Abbot-Archbishop lives in his metochion in Cairo. The EP's former bishop Osborne of Sourozh brought up that West of Egypt belongs to Rome but that seems to be believed less than his interpretation of canon 28.
And well to the 17th, Antioch was still coveting Cyprus, and thereafter had to repeatedly have Antioch and Constantinople manage its affairs-the last time was a crisis which dragged on for decades and propelled then Archimandriate Meletios Metaxakis onto his career.