And no one will. For some part of “oral tradition” to be of equal authority with the written word it would have to come either from the lips of Christ or a person speaking under the inspiration of God’s spirit and be preserved as such so that we could have it today knowing its source.
It’s kinda like waiting for a sola scriptura protestant to explain how they “know” that the Bible is inspired by God.
I believe it is and you believe it is, but can you or any of us prove it?