Those are mere claims without evidence. Show us documentary proof of exactly when this alleged magisterium came into existence and of its magisterial succession -—
it is clear in matthew that Christ gave the keys to bind and loosen to the apostles and that the apostles held councils IN THE BOOK OF ACTS.
magisterial is your silly word so cling to it all you like, the apostles trained leaders whom had already been baptized and believed and come under the sway of the Holy Spirit, and these leaders met 7 times in ecumenical councils.
1400+ years after Christ a flunky lawyer decided he knew better than the entire assembled church and decided, without the help of modern archaeology btw, to retranslate the entire bible using new sources, and made up the notion that the Bible was the unabridged encyclopedia of the faith.
Since Jesus Himself never wrote a document, your requirement would imply that even the Twelve had no authority, since they could not therefore produce any "documentary proof" that they had been authorized and commissioned by Christ Himself. Do you deny the authority of the Twelve? Or do you in their case make an ad hoc exception to your demand for "documentary proof"?
-A8