The RC does not have to raise the mgisterium to the same authority of Scripture seeings it is the authority of Christ which created the magistrium so that it IS of the SAME authority of Scripture.
Scripture is subordinate to the authority of Christ and teachings of the Apostles.
The RC gave you the teachings of Christ, then they gave you the traditions of the apostles, then they gave you the Scripture.
Why do the scriptures have to declare that which is obvious?The scriptures only profess that which is less obvious in the teachings of Christ, not that which is in everyday use, custom and practice.
You cannot use the Scripture against the Church whose scriptures they are.