Pat M...some of the flaws of the KJV are the non-understanding and mistranslation of eon, eonian and anything "time related"--as well as not differentiating between hell, hades, lake of fire, gehenna, outer darkness, et. al.
I looked up the verses and then read the commentary of the NKJV and it was absurd---
CLV translation: vs. 4-7 "....and the souls of those executed because of the testimony of Jesus and because of the word of God, and those who didn't worship the wild beast or it's image, and did not get the emblem on their forehead or on their hand--they also live with Christ a thousand years. (The rest of the dead do not live UNTIL the thousand years should be finished). This is the former resurrection. - parenthesis: theirs caps: mine
6. Happy and holy is he who is he who is having part of the former resurrection. Over these the second death has no jurisdiction, but they will be priests of God and of Christ, and they will be reigning with Him the thousand years.
7. And when the thousand years should be finished, Satan will be loosed out of his jail. And he will be coming out to deceive all the nations which are in the four corners of the earth---".
I have no personal comment, as I wouldn't pretend to have a knowledgeable understanding, but I thought the translation would help you.