Hebrews 1:1-3 (Good News Translation)
1 In the past God spoke to our ancestors many times and in many ways through the prophets, 2 but in these last days he has spoken to us through his Son. He is the one through whom God created the universe, the one whom God has chosen to possess all things at the end. 3 He reflects the brightness of God's glory and is the exact likeness of God's own being, sustaining the universe with his powerful word. After achieving forgiveness for the sins of all human beings, he sat down in heaven at the right side of God, the Supreme Power.
First of all, this scripture mentions that God has spoken to humankind in the past, using prophets. But of course, Jesus isn't like other prophets - he is also God, saviour, and king.
It then mentions that God created the universe through his Son.
But it then uses the word "chosen" - and also implies that before he ascended Jesus was not sat next to his father. Other versions use the word "appointed" but I think that for a person to have been appointed to something they first must have not been a part of whatever they were appointed to! I shall discuss this next:
This text implies that before he achieved forgiveness for the sins of all human beings (i.e. by being crucified) he was not seated at the right hand side of God The Father. It says he "sat down" next to him which implies he was not seated next to him before he was incarnated as a man. Also, where it says in verse 2 that he is the one "whom God has chosen" implies that there are other beings who could have been chosen to be saviour.
This shows us that Jesus was chosen from amongst other divine beings to become a member of The Godhead - that he earnt that position through being sacrificed and that God could have chosen another being to go down to Earth and do what Jesus did.
I believe he was "chosen" to eventually become a part of The Godhead when God made him exist as The Word, just prior to the creation of this universe. I believe he could have begotten any kind of being but chose one that would become like Jesus.
I believe this opinion is scriptural.