His proxies certainly did. You are still woefully ignorant of the history of the Church. You still have no answer to the actions of guys like Nestor and their policy of excising people that differed from one vision with a torch and sword. The Bible as we know it was put together by men. We do not even know who all of these proxies were.
I am well aware of the concept of cross verification. It seems you do not understand it.

error prone
Look up confirmation bias and assumption. There is nothing saying that Constantine's was the 'correct' version and the other versions are error prone.
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Let's make an assumption that the Bible is indeed the work of God and there is/was a perfect rendition. If that were the case then a 'cross check' of another perfect version would come back precisely the same. Further, piecemealing a bit here and a bit there does not demonstrate that another is a perfect whole. IT means that pieces in an of themselves may both be correct but this is supposed to be the divine word and not a jigsaw puzzle.