Unshacklethechains - "appears to indicate that Christians will rule as kings and priest along with Christ ON the earth."
The problem with the word 'kings' is that early translators have that particular option for the original Greek word. Subsequent translations - including RNWT - clung on to 'kings'. Other alternatives are, to reign as a governor, of the reign of Christians in the millennium, reign with authority.
I say "problem" because Psalm 45:16 prophesies that 'princes' will be appointed on the earth - not kings. Princes are sons & brothers.