I do understand where you are coming from but Im not in agreement. I think we are looking at the same end result, but from different perspectives or perhaps we have a different understanding of willfulness.
What you see as willfulness on the part of Jesus coming from eternity to earth, I see as obedience. I cannot imagine Jesus wanting to leave the Father whom He loves with all of His being. In my view, Christs will would be to stay with the Father, but He surrendered His will to the Father and came to earth to do His bidding. Of everything Christ suffered on the cross (Psalms 22) - rejection, even temporary, must have been the worst.
Indeed, Moses was the most humble man on earth. You call it willfulness that Moses subordinated himself to God, I call it obedience.
Certainly Paul was strong willed. And when his self became at issue, God gave him a thorn in the flesh to humble him:
And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me. Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong. II Cor 12:7-10
In an earthly parallel, a loving married couple can be so into each other that when the husband dies, the widow (or widower) cannot tell you whether she wants a hamburger with cheese because thats what she wants or because thats what he always wanted. The two were one.