Greetings again Aaron. Blessings and love to you and your family.If not for the plan of Redemption, what role would the Son fill?
I have not read any other posts other than your OP.
I also think this is something that cannot be answered since our perspective is from what God actually decreed. However, here is what I think we know for sure..
(1) God, the Trinity, is eternal. God the Father, Son, and Holy Spirit.
(2) None of the three persons that are one God are contingent upon creation to exist. In other words, God the Son's existence is not contingent upon anything (especially something created).
(3) Scripture tells us that God the Son, Jesus Christ, is both conquerer AND savior within this world God chosen to create.
When we us the term 'role', we mean a part played within a creation. That is, a 'role' is a part one plays in a larger purpose of the overall plan.
Now it is my belief that the Scriptures point toward God's purpose, in this actual world, being to put all enemies, seen and unseen, and all principalities and powers under subjection of God the Son, so the full presence of God is manifest in His creation. This purpose includes within it, a desire to conquer 'conceptual power', like 'sin' and 'death' (this is what I mean when I say 'unseen'). As well as actual existing corporal and spiritual beings (seen). The Role of the Son of God therefore becomes that of conquerer and savior.
Earlier theologians postulated that God decided to create a 'maximal world'. In most senses I agree with this. I do believe God decided to show His full presence within creation. My point in bringing this up is how it relates to your question. If God decided to create a maximal world then your question is basically reduced to asking, if God decided to create some other lesser world, what would be God the Son's role? I guess an answer to that could be... just a conquerer and not also a savior.
After all that, I think my point is that the question doesn't flush out what I think, you think it does. I could be wrong about that.
Keep seeking God's truth as if it were hidden treasure.