That’s an Orthodox timeline which makes the Greek Church the one & only in the True Christianity department, and relegates all the others to the outer darkness of heresy.
Kinda like how the Mormons see Christians. And BTW is there only sweetness & light between the Russian Church & the Greek Church in that timeline? You know, those folks who call Moscow the “Third Rome”?
Those bearded Greeks ready to riot over the Pope’s arrival need to realize that appearances count. Some look rather Islamic, don’t you know?
Allegiances to physical phenomena in the world can be powerful and the Orthodox are not the only believers in that boat. Warning might be taken from the way Jesus warned the Jews not to brag about being (physically descended) children of Abraham because God can raise more of them “from the stones.”