Not so fast.
As disembodied spirits (with only limited access to the world of sense) demons would be bound by imperceptible chains wherever they are, and there are many gloomy caverns here on earth (including the minds of unregenerate men.)
When an evil spirit comes out of a man, it goes through arid places seeking rest and does not find it. Then it says, ‘I will return to the house I left.’ When it arrives, it finds the house unoccupied, swept clean and put in order. Then it goes and takes with it seven other spirits more wicked than itself, and they go in and live there. And the final condition of that man is worse than the first. (Matt. 12:43-45.)
Jesus had commanded the evil spirit to come out of the man. Many times it had seized him, and though he was chained hand and foot and kept under guard, he had broken his chains and had been driven by the demon into solitary places. Jesus asked him, “What is your name?” “Legion,” he replied, because many demons had gone into him. And they begged him repeatedly not to order them to go into the Abyss. A large herd of pigs was feeding there on the hillside. The demons begged Jesus to let them go into them, and he gave them permission. When the demons came out of the man, they went into the pigs, and the herd rushed down the steep bank into the lake and was drowned. When those tending the pigs saw what had happened, they ran off and reported this in the town and countryside, and the people went out to see what had happened. When they came to Jesus, they found the man from whom the demons had gone out, sitting at Jesus’ feet, dressed and in his right mind; and they were afraid. Those who had seen it told the people how the demon-possessed man had been cured. Then all the people of the region of the Gerasenes asked Jesus to leave them, because they were overcome with fear. (Luke 8:29-37.)
Demons would apparently prefer the gloomy dungeon of an enslaved human host (or even a pig) to some more uncomfortable confinement (in what scripture calls “the Abyss”), but they’re hardly free.
I believe they have been cast out of haven, and they are held in imperceptible chains until the day of judgment.
Jesus accepted the view that demons have a prince over them (whom the Pharisees called Beelzebub), identified that prince as Satan, and predicated His entire argument on demons being the underlings of a Satanic kingdom.
It would be equally difficult to grasp why Adam made his “job switch” (from immortal master of the world, to a slave of sin, death, and Satan)–when oversimplified, and viewed from a distance (with the benefit of hindsight.)
The same could be said of Saul’s “job switch” (from king of Israel, to condemned man trying to hold on to a forfeited throne.)
And (more recently) Napoleon Bonaparte’s “job switch” (from Emperor of all Europe to a convict on the island of Ebla.)
Scripture explicitly says that angels sinned, and were cast out of heaven (2 Peter 2:4;Jude 6.)
So if you’re truly conceding
You’ll have to concede that point!
As to whether Tartaroo can rightly be viewed as the disembodied state of fallen angels, I ask you to consider the following:
…in the resurrection they neither marry nor are given in marriage, but are like angels of God in heaven. (Matt. 22:30.)
All flesh is not the same flesh, but there is one kind of flesh of men, another flesh of animals, another of fish, and another of birds. There are also celestial bodies and terrestrial bodies; but the glory of the celestial is one, and the glory of the terrestrial is another. There is one glory of the sun, another glory of the moon, and another glory of the stars; for one star differs from another star in glory. So also is the resurrection of the dead. The body is sown in corruption, it is raised in incorruption. It is sown in dishonor, it is raised in glory. It is sown in weakness, it is raised in power. It is sown a natural body, it is raised a spiritual body. There is a natural body, and there is a spiritual body. (1 Cor. 15:39-44.)
As they were saying this, Jesus himself stood among them. But they were startled and frightened, and supposed that they saw a spirit. And he said to them, “Why are you troubled, and why do questionings rise in your hearts? See my hands and my feet, that it is I myself; handle me, and see; for a spirit has not flesh and bones as you see that I have.” (Luke 24:36-39.)
For our citizenship is in heaven, from which we also eagerly wait for the Savior, the Lord Jesus Christ, who will transform our lowly body that it may be conformed to His glorious body, according to the working by which He is able even to subdue all things to Himself. (Phil. 3:20-21.)
From the above, it would seem “gnostic” to deny that heavenly angels have bodies (and that fallen angels are disembodied spirits.)
BTW: The 5th ecumenical council didn’t condemn Origen for his belief in universal salvation (or even for speculating that Satan and his angels might eventually be saved.)
It condemned him because the views being propagated in his name contained gnostic elements (such as the pre-existence of souls, the temporality of bodily resurrection, and an apokatastasis that involved spherical bodies [and may have ultimately involved absorption, and loss of personal identity.])
I think this is why that same council saw no contradiction in naming Gregory of Nyssa (who explicitly taught the final salvation of wicked men, fallen angels, and Satan himself) among the Orthodox doctors of the Church.