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.
If the attendees of this council of Jerusalem had the keys and the authority therein, then why is it that this council and its decrees were subsequently either forgotten or ignored or set aside by later church "magisteria" who came to revere the Council of Nicea as the first council of the Church rather than the Council of Jerusalem?