You’re gonna have to help me out here.
Where in scripture does it say unwritten Apostolic teaching is subordinate to written teaching?
Do you contend any post-scriptural speakers are superior, or equal, to those who wrote Scripture?
If “yes”, then kindly detail one post-Scriptural teaching on par with Scripture, and why we should elevate & append it thereto. (Something which, presumably, does not contradict nor claims exemption to Scripture.)