Thank you for this post. I agree that the distinction between human and Divine is important when interpreting the Gospels.
I have bolded areas of the lovely and informative post in order to draw out a point from it: a “commission”, as you put it, "in order to…“do…the Will of the One who sent me”.
I would reason this as a ‘resting’ in His Father’s Will. An aligning of his humanity and Divinity - a recollection. In this way, we could say He “chose” to do this. But I still think the word “chose” is a very weak word. The truth seems more to be that He prayed, and grace aligned His very mission in response to His Agony, His reason for being here, with the Father’s Will. He submitted/rested His future into the hands of His Father. To “choose” while consisting of the human aspect seems to forget the Divine, and I think furthermore, to say: “chose to die” or the Father "chose His Son’s death, in whatever way, seems to be akin to human reasoning. The Will of our Creator is perfect. He does not need to “choose” because He IS. We could say that our Lord “chose” to pray. But the words “order” and “commission” and “do the Will” does not seem like choice.
But we’re going off the point. I was saying that the Father did not choose His Son to die. And so the reasoning behind why the Father sent the Son, or the Son chose to be born on earth, is still relevant. The Divinity of the Father means that the choice is not a choice in the the way we understand this word as mere humans, this ‘choice’ was rather a perfect means, to which the Second Person must have agreed to before He was born, as the Holy Trinity is in agreement and perfect relationship; therefore, when our Lord was begotten, this mission was already in Him, and prophesied within time. Maybe we can use the word “chose” or “choose”, but only very loosely, IMO.
Thank you for your thoughts.