Part of oral tradition is "HOW" one reads the Scriptures! Do you not see that the Sadducees and the Pharisees read the exact same books of the Pentatuech, and came up with different means of fulfilling it, interpreting it? Again, even their idea of WHAT WAS Scripture was not agreed upon. The Sadducees only considered the Torah proper, the first five books of the Bible, as Scripture. THIS, my friend, is ALSO oral tradition. The mannerisms of how they worshipped in the synagogue is also oral tradition. Their daily lives is another example of oral tradition. And finally, their obedience to the Pharisees was based on oral tradition - the seat of Moses.
As we have painfully noted, people understand Scripture differently. This was also true for Jews of Christ's time. Some viewed divorce differently. There are many such examples in the Gospels. WE also come to Scripture differently. This "Lense" that we use to view the Bible is different - it is determined by our own Traditions.
Regards
So does that mean that Jesus was speaking through a Catholic lens? I would think that Jesus would be the one to create the lens, not follow the lens created by man. As you mentioned, one example is His teaching on divorce. Man's lens on the subject was corrupt and He corrected it.