This is a very poor assumption upon which you seem to rest the remainder of your thesis....
This isn't even a biblical idea -- as between the law and the prophets we are given the Lord's heart on many matters -- even the body of Messianic prophecy gives us interpretative insight to the life, ministry, and propitiation of Jesus.
Paul spoke these words to the elders....
Wherefore I testify unto you this day, that I am pure from the blood of all men. For I shrank not from declaring unto you the whole counsel of God.
We would do well to see the value of the whole counsel of God.... in the matters of discpleship, spiritual stewardship and the ministries of the Kingdom.
Actually I think that the author was being brutally honest, with himself, with us, and with those whom he disagrees with.
He is simply stating that as fallible men we put more importance into some scriptures. We then interpret other scripture through the scripture we have chosen as more important. We use the scripture that fits our world-view to color the scripture which does not.
He never says that this is what we ought to do or that it is right, just that we do it. Just like those whom he has taken to task.
You could say that he is acknowledging the splinter in his own eye.
We would do well to see the value of the whole counsel of God.... in the matters of discipleship, spiritual stewardship and the ministries of the Kingdom.
I could not agree with you more, and I am sure that the author would agree with you also.