Very well-reasoned, ChristianObserver. I enjoyed reading that.
PS. One of the difficulties I have is reconciling the WTS view that the master has already arrived and appointed them over all the master's belongings. Seeing it from that perspective, 'all the master's belongings' are people - the master's slaves.
However, a master would own property, possessions, land, and not slaves only. If, according to other texts, Christ's belongings are heaven and earth and authorities, and his slaves are to be joint-heirs with him, how can the WTS think they have already been appointed over all his belongings?