@ Rattigan,
The view used to be ( correct me I am wrong, because it is confusing ) that the FDS and Domestics are the same group viewed from different perspectives. I am still going through this in the CD-Lie-brary. Here is an quote from a super-long article containing mostly gibberish.
Watchtower 2/1/1952 Jehovah's Theocratic Organization Today
"THE FAITHFUL AND DISCREET SLAVE"
5 "Who really is the faithful and discreet slave whom his master appointed over his domestics to give them their food at the proper time?" The slave and the domestics are the same persons, only from different viewpoints. Under the term "slave" Christ's anointed followers of today are viewed as a class, a composite slave or composite servant. God himself so interprets matters: "Ye are my witnesses, saith Jehovah, and my servant whom I have chosen." (Isa. 43:10, AS) Note that many witnesses are called one servant. Under the term "domestics" those making up the slave class are viewed as individuals. They are spoken of as "body of attendants" at Luke 12:42 (NW). Murdock's translation from the Syriac agrees in using "domestics" at Matthew 24:45, and another translation from the Syriac, by A. S. Lewis, renders it "companions", that is, companion slaves. They are domestic slaves in the household of God and, as a united class or society, are termed "the faithful and discreet slave". Similarly, when a number of domestics turn wicked and start to beat their fellow slaves these evildoers become the foretold "evil slave" class.-Matt. 24:48-51, NW.
So the " old light " was that only the anointed are the FDS and Domestics. You could not be a domestic and not be anointed. If you are annointed then Christ is definately your mediator. Whether or not all Christians are included in the covenant for a kingdom remains to be seen IMO. Still, Christ is the mediator for the NEW Covenant! As is stands now, the FDS/GB/domestics are the boss of the regular anointed/Non-GB/FDS domestics and the non-anointed/non-FDS/GB domestics. So Christ is the mediator for 2 groups of domestics, but not the third. BTW, the entire article from the 1952 WT is straight up Cray-Cray! I will post it anyone wants to accept the painful task of reading it..
@ Cedars,
I get what you are saying about FDS succession. That is especially strange since the heavenly calling ended in 1931. As time proved the errors of the WTBTS prognosticators, new GB members were needed to run the corporation feed the domestics. These domestics were anointed who were represented by the GB. These were the same group, just viewed from different perspectives, with Christ as their mediator. This changed at the last annual meeting with no explanation.