Your theory doesn't work. Your theory would mean that 'hell' is cast into 'hell'. // with the same meaning. Gehenna is the 'hell' that occurs after judgement, not before.
Hebrew Sheol and Greek hades are Not the same words as Gehenna.
Sheol and haides or hades is the grave. Those in the graves will be resurrected as per Revelation 1:18.
Gehenna was a garbage pit (Not a cemetery). A garbage pit where things were destroyed Not kept burning forever.
KJV translated the word Gehenna into English as hellfire.
Emptied-out biblical hell (grave) is cast into Gehenna (destruction) after everyone is ' delivered up ' ( resurrected ) out of biblical hell according to Revelation 20:13-14.
So, Gehenna ( meaning destruction) does occur 'after' judgement. Such as: destruction for the haughty figurative ' goats ' of Matthew 25:31-33 who are adversely judged at the soon coming ' time of separation ' to take place on Earth.
All the wicked are destroyed forever according to Psalms 92:7.
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