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There’s a variation of up to, what , 81 books. That seems pretty significant. The local synods at Rome, Carthage, and Hippo were never considered ecumenical, or binding on the whole Church, AFAIK.
A single recognized was not the way of the early Church.
The variation among canons within the ******recognized
****** patriarchates is small, if you consider the recognized patriarchates rely heavily on books for doctrine that are recognized as canonical by the other patriarchates, so for 99% of purpose, they use the same canon. (I would argue that is ****why ****these particular patriarchates were recognized). And others not.
The slight variation in scriptures drawn on for doctrine is insignificant, compared to the huge variation between the recognized patriarchates, and for instance, the gnostics and others, who ****drew **********doctrine ******from a wildly different pool of scriptures. So the other patriarchates did not get recognized, because their doctrinal pool led them too far from the single template. (Recognized or unrecognized by whom?)
I agree with you that those synods were not ****in **********themselves ******binding on the whole Church. If they had, and still have, authority, it is only because somebody singular utilized them (and not other synods). It would seem that somebody singular had recognition by a fair number of Christians, with a single doctrinal template and they either persuaded, silenced, or killed off the other Christians, so later on you had only one circle of patriarchates standing. The others, maybe the majority of Christians, either buried their scriptures in the ground, left Christianity, or accepted the one template maker.
If you want to attack the single ancient template maker as ruthless or stifling to the other Christianities, I can’t refute you. But If you argue the absence of a single, victorious authority, that does not seem consistent with the outcome.