I have been saying it over and over. Man was created so there could be the Son of Man.For this purpose the Son of God was manifested, that he might destroy the works of the devil. - 1 John 3:8 KJV
It was a long road, but I think I finally understand where you're coming from.
Man was created a little lower than the angels because of, the death. The death of which Satan the devil had the power thereof.
The Son of Man, Jesus was made a little lower than the angels because of the suffering of the death.
I believe before Adam was created the devil was already the sinner and needed to be destroyed. That would take place by the Son of Man being manifested as man created in the image of his creator.
Acts 15:18 'Known from the ages to God are all His works;
God foreordained before the foundation of the world, the need to be redeemed. 1 Peter 1:18,20 The redeemed become the sons.
Gal 4:1-7
Adam was created to bring the need for the foreordained redemption which would be the destruction of the devil.