I had breakthrough with elder. The back & forth changes for Romans 13:1 prove that of all Christian religions, it is not possible that JWs have Gods backing. How could Jehovah allow all religions except JWs to have the correct understanding, something JWs have now accepted. Just give them the watchtower references over the years.
We've got all the proof but how do you persuade a JW to look at their own evidence? 'm still working on it.