"Dark angel".... hmmmm
I don't think you really understand the BIG PICTURE.
Once Adam sinned without having had children then he and all his children were condemned to death. Period. God could have killed Adam right then and there and none of us would have been born. He could have just created a new couple, killed Satan and started over.
But, he could see US. YOU, specifically. The potentiality of you. The specific children of Adam. They would have been lost. Satan would have gotten away with the mass murder of billions.
So the choice was to let by-gones be by-gones and start over, too bad for Adam's children, OR to bend the rules. There are two caveats:
1) The sentence of DEATH for sin was not specifically defined. That is, was it death forever, or for just three days. The sentence is carried out after death. But no one said God couldn't raise up back to life anyone who had died. That caveat #1.
2) Caveat #2 is that in order to include Adam's children on this temporarly death sentence amnesty, you had to be able to have some sort of a ransom sacrifice. So God made up a rule that if someone voluntarily gave up their perfect human life, dying without children, then God would accept that sacrifice of all those potential perfect lives in exchange for Adam's children.
What many don't understand, is if the RULE to have the sins of the father come upon the sons was not in place, then the sinless father could not save them. Because of that rule, since one man sinned and brought death to all his children, one perfect man without children could undo this.
But really, SIN and the LAW and mankind, the physical universe was created to get rid of Satan. You see, up in heaven it's just TALK, basically. You can't kill anybody. You don't need to steal anything. So it's just talk. But talk is annoying. So basically, Jehovah created a situation for Satan to put his mouth was. He knew Satan was an elitist so he created mankind and made him in God's image and created a scenario that if taken advantage of, could allow Satan the thrill of a lifetime, a thrill worth dying for, which was killing billions of people! Which he did. Only God turned the tables on him. Those who would die could be brought back to life if God chose. So in this way, God gets rid of Satan and the rebel angels. Basically all the good angels decided to die for God's cause for a short time and be brought back. Satan would have to comply with the same general policy only he won't be brought back.
So you see, DEATH doesn't really amount to much at all, unless its PERMANENT. DEATH satisfies the letter of the law but its flexible as far as eternal life is concerned because God can bring back whom he wants AFTER death.
So it's all kind of a process, painful, maybe confusing for some, but in the end, the only people who end up dying are those who would have rebelled with Satan anyway and God would have executed them. All the good people will have the chance to life forever.
So this whole process of pain and sickness and death is to get our "ticket" to life later on. We need to be born and then die in order to be part of the later life planned for us.
I believe the ratios will be similar for humanity as for the angels in heaven. Two-thirds will serve and love God and a third will opt out. Collateral damage. But Satan and his demons will be GONE! Forever. Everyone alive will have died, being tested to the death for their integrity, so there will be no more rebellion.
The earth will still be a crown of God's creation with maybe 4 billion people left on the planet and forever to get to know each other. If everybody was made room mates with every othe human for one year, every other year, just so everybody would one day say they know everybody else, it would take 8 billion years. Just a thought.
MAN was created to get rid of Satan, because with MAN and the physical universe, you could have LAWS and SIN, and thus DEATH.
SATAN gladly died for the chance to kill mankind. But if he knew he'd only be killing permanently the wicked and all the good would be saved, would he have bothered? Doubtful.
But God's like that. He plays games. He turns the tables. He likes to wager and gamble. So he said man would die but he didn't say how long they would have to die.
It's INGENIUS! Just make a rule that EVERYBODY MUST DIE and kill everybody! Even your own only-begotten son. Just like during the Flood. Then after that, you bring back who you want and the incident is forgotten. Satan can't say anything. And Christ and the faithful angels gladly would die for the cause of getting rid of Satan, so it all worked out. Satan has to live with being outsmarted and tricked. ALL he has left is to kill as many as possible. He is focussed. That's his only legacy. He loves killing mankind so he may as well go for it. In the meantime, it works out for God because Satan exposes the evil in the hearts of mankind who deserve to die if they rebel, so Satan is now part of the clean-up crew. Jehovah is using him.
JC