@JonC I am not going to start a pt 3 but consider
The soul that doth sin -- it doth die.
A son doth not bear of the iniquity of the father, And a father doth not bear of the iniquity of the son, The righteousness of the righteous is on him, And the wickedness of the wicked is on him. Ezek 18:20 YLT
Why because scripture has construed all under sin, There are none righteous , no not one.
Other than the just one. The one who did not know sin.
2 Cor 5:21 for him who did not know sin, in our behalf He did make sin,
that we may become the righteousness of God in him.
My understanding: because he was made sin, he gave his life, became obedient unto death even the death of the cross from Phil 2:9
wherefore, also, [Because of the obedience unto death] God [The Father raised him out of the dead] did highly exalt him, and gave to him a name that
is above every name,
Because he was sinless of himself he was the only one our sin could be transferred to.
Sin and death were transferred to him and righteousness and life is transferred to the redeemed, in Christ.