Romans 5
I don't see how this explains it. So feel free to expand on that.
What I get out of Romans 5 is this: By the sin of one, death came to all men therefore it is equitable, fair, and just that by the righteousness of one and His gift of righteousness that many are made alive. It satisfies God`s righteous judgment.
Jesus is the vine that gives life to all the branches. They all originate with Him by His gift of righteousness.
As a side note: This is why salvation can never be earned. We are unable to earn the righteousness that Jesus has and freely gives us.
Romans 3
24 Being justified freely by his grace through the redemption that is in Christ Jesus:
25 Whom God hath set forth to be a propitiation through faith in his blood, to declare
his righteousness for the remission of sins that are past, through the forbearance of God;
26 To declare, I say, at this time
his righteousness: that he might be just, and the justifier of him which believeth in Jesus.
All the branches originate with the vine.
Romans 8
28 And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
29 For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
30 Moreover
whom he did predestinate, them
he also called: and whom he called, them
he also justified: and whom he justified, them
he also glorified.
He AKA the Vine does it all.