I don't have all the answers. Maybe you should try to find out for yourself. I do know the bible is subject to interpretation and that interpretation comes from men and not from God so it is not infallible.
Gehenna is prophetic, it hasn't happened yet. The first thing to know about prophecy is that a prophecy in scripture is not subject to our own personal interpretation. We must let the Bible interpret itself. The soul is an example.
Paul said, "Now may the God of peace himself sanctify you completely, and may your whole
spirit and
soul and
body be kept blameless at the coming of our Lord Jesus Christ."
(1 Thessalonians 5:23 ESV)
Paul explains elsewhere that there are natural bodies and there are supernatural bodies.
(1 Corinthians 15:44 ESV)
In either case a person is made up of body, soul, and spirit. So a body may be natural or supernatural and a spirit is by definition spirit. But what is the soul?
We already know the soul is not the spirit, so what is it?
A soul requires two things: a body and a spirit, and in Greek it is the
psuche, referring to a person's mind.
A natural body can be dead or alive. Death is defined as the separation of of body and spirit.
(James 2:26)
Since the soul requires a body and a spirit, a soul is alive or dead depending on the state of the body. A flatlined brain processes no information, it is dead, nonfunctional.
With the existence of body and spirit a soul can be restored to life or it can be destroyed by a second death and is then not recoverable.