Oral Tradition is how the gospels and letters were communicated before they were ever compiled into a book. See post #29.
It would follow, would it not?, that the oral and written would agree then and not contradict each other and require a Christian to entertain a question of which one to accept as truly God's Word.
As in Jesus’ day “oral Tradition” and what we accept as the God inspired Scriptures are often set in juxtapose.
It was not that ALL oral tradition was unacceptable but that which contradicted the written Word or that which was done as though it fulfilled the requirements of God's law.
Today much of what is “oral Tradition” falls in that class.