If this was the real truthful situation then if a member of any JW congregation committed a 'sin' with a member of another JW congregation then the body of elders in each congregation could do nothing about. Why? Each congregation is its own religion and not related to others.
Just to confirm here, in the Registered trust deed of my congregation, they have mentioned that the congregation adheres to the biblical teaching and doctrines of the Ecclesiastical Governing Body of Jehovah's Witnesses and that they are responsible to the creator, Jehovah God. No mention about the country's branch office. So legally, my congregation has no relation with the local branch office.