So Paul will have a throne in the Kingdom when Christ returns? Indeed, presuming he forsook all to follow Christ and was an overcomer, as that is what Scripture says, as shown. (Matthew 19:27-30; 1 Corinthians 6:2; Rv. 3:21)
First of all, 1 Cor. 6:2 says NOTHING of Paul seated on an earthly throne in the earthly Messianic Kingdom with the 12 and Christ, judging the earthly twelve tribes of Israel, as Matt. 19:27-30 talks about Peter and the 11, NOT anyone else. There are 12 thrones there plus Christ's. Don't attempt to stretch Scripture to fit your thinking. Your thinking needs to conform with Scripture, not the other way around. As far as Rev. 3:21, we are ALREADY seated with Christ in heavenly places. If we are already seated with Him, how do we get re-seated with Him? And BTW: "to him that overcometh"?? Do you honestly believe that is meant to the Body of Christ, this Body formed by the grace of God, in this dispensation of the grace of God? If you do, it's worse than I thought. If we must overcome something, then we are not secure in the finished work of Christ. And that opens a whole other subject, Daniel.
2 Tim. 2:15 is your friend.