The religious leaders: the Pharisees, Scribes, the High Priests and the Sadducees were the theologians in the Bible.
The Pharisees, Scribes, the High Priests and the Sadducees did not write the Gospels.
God gave His word to the Prophets in the OT and to the Apostles in the NT also known today as the Bible or the Holy Scriptures.
The OT prophets enjoyed a divine pathos, they view the world from God's perspective, but the 'word' spoken by the prophet was both God and man's word. A good example is Amos: 1:1 begins with 'The word of Amos, it ends in 9:15 with "Thus says the Lord your God". God's word in Is. 2:1 contradicts His word to Joel; "they shall beat their swords into ploughshares", "Beat your ploughshares into swords, and your pruning hooks into spears." The encounter, the message may be God's, the 'word' is human.
The Word of God was given directly to the Prophets and the Apostles to preach it to the people without adding and subtracting from the very Word of God
If that were true there be no reason for multiple gospels, there are four and no two are the same. Compare Mk and Jn. There is a very human Jesus in Mark, and a God coming down from heaven in John. Without the narratives supplied by the theology of these 2nd generation authors we would have less knowledge of the person of Jesus and his teaching.