The dead sea scrolls were from a sect called the essenes. They write about the teacher of righteousness.
They were doing Midrashic readings of the OT. They looked at select verses for hidden meanings a la Bible code.
This is how Philo of Alexandria came up with his Logos by combining Platonic/Hellenistic ideas, and midrashic reading of the OT.
Guess what. Philo's archangel Logos has the same descriptive names for Paul's Jesus. Firstborn of God, image of God, God's agent of creation to name a few.
Jesus started as an archangel from midrashic reading of the OT that later got confused as historical.