Not only that, The GB staged a Coup when they went from teaching FDS = Anointed Remnant (gb just representing the Remnant)... to GB=FDS.
Watchtower 1981 Mar 1 pp.24-26
"Witnesses of Jehovah understand that the "slave" is comprised of all anointed Christians as a group on earth at any given time during the 19 centuries since Pentecost. Accordingly, the "domestics" are these followers of Christ as individuals.
Some readers may feel that this is a rather sectarian view of matters. Or they may object to the idea that the "slave" and the "domestics" represent the same class, one as a composite body and the other as individuals. The objectors may argue that not all of Christ's anointed disciples have a share in preparing the spiritual food, so that perhaps the "slave" pictures only the leading ones, and the "domestics" those they serve in the congregation.
There is no point in trying to force an interpretation of the parable. Self-deception is of no benefit and is spiritually damaging. Therefore, we must look to the Scriptures for an understanding. In doing this, what do we find? [ ... ] Thus we see a clear Scriptural basis for saying that all anointed followers of Christ Jesus make up God's "servant," with Jesus as its Master."