I am not sure I have an answer that fits, but... let us look...
I guess we would have to know what a soul is... or should it be a living soul? Adam and Eve seemingly were living souls until they ate of the wrong tree:
"And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul" Gen 2:7
"But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die." Gen 2:17
"And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat." Gen 3:6
When they had eaten of that wrong tree, were they still living souls or were they then dead souls or simply with no soul involvement? It would appear to me that they, whatever "they" is were dead.
Later Solomon writes of the soul of a man enjoying things:
"There is nothing better for a man, than that he should eat and drink, and that he should make his soul enjoy good in his labour. This also I saw, that it was from the hand of God." Ecc 2:24
Was it however perhaps that dead soul acting as if he were alive and enjoying the of good in his natural labor, which seemingly has no definite reward beyond this world of flesh?
"Who knoweth the spirit of man that goeth upward, and the spirit of the beast that goeth downward to the earth?" Ecc 3:21
What spirit are we of? How does that pertain at all to the soul, dead or otherwise?
"Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sinneth, it shall die." Ezek 18:4
Yes, the sinning soul dies, but what if the soul of a man is already dead because he never yet received the Life God provided through Jesus? Who of us was sinning before we met Jesus and who was simply already dead "living" as a zombie without renewal or rebirth or God?
"And when his disciples James and John saw this, they said, Lord, wilt thou that we command fire to come down from heaven, and consume them, even as Elias did?
But he turned, and rebuked them, and said, Ye know not what manner of spirit ye are of." Luke 9:54-55
What was our spirit prior to receiving the Holy Spirit... if we have...? What is our spirit, when and if we have received the Holy Spirit?
Paul writes as to how it has been:
"And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit." I Cor 15:45
Were there any living spirits at all once Adam and Eve in the Garden of Eden ate of that forbidden tree? But... then came the "quickening spirit" [the Holy Spirit that brings to Life?]. Is this what Jesus was? Is this what Jesus brought?
"Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me." John 14:6
"The thief cometh not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly." John 10:10
Do we have an answer or do we have more questions that perhaps we don't really even understand? Hmmm?
"And the second angel poured out his vial upon the sea; and it became as the blood of a dead man; and every living soul died in the sea." Rev 16:3
What is see here is the "living souls", that is those quickened by the Holy Spirit made Alive as Jesus was Alive... but then a number of them chose to jump back into the sea which is a place of overly salted waters which when drunk will kill a man. This is the rebuttal I guess for OSAS if you can see it.
I still don't know if it answers your question, however... The spirits may return to God, but the souls not already dead do die if they have not been quickened. The quickened ones, the one that do not choose to jump back into that sea of death, should then find a place with God.