The WTS changed the definition of the FDS in 2012 > https://jwfacts.com/watchtower/faithful-discreet-slave.php
Who Does the Parable refer to?
Is it apparent that the faithful slave is the Governing Body? No, as shown by Watchtower changing its teaching on who the Faithful Slave is several times. For a detailed article on these changes see Faithful & Discreet Slave Changes.
Is it clear that the faithful slave was chosen in 1919. The article How 1919 is Derived shows that there is no justification for 1919 having any significance.
For many decades, Watchtower taught that the faithful and discreet slave included all 144,000 "anointed" Jehovah's Witnesses. It wasn't until the 2012 Annual Meeting that the Governing Body greatly increased their own authority by announcing that they alone represented the faithful and discreet slave.
Originally, Russell said the Slave was an illustration of the entire body of Christ, the little flock of 144,000 heavenly rulers.
The Slave was described as the little flock - the 144,000 - extending from the time of Jesus.
"Over a period of more than 1,960 years, that work of education has continued, preparing a little flock made up of people from "every tribe and tongue and people and nation" to serve with Christ in his heavenly Kingdom." Yearbook 1996 p.3
In 1981, anyone that felt the Slave did not include all the 144,000 were vilified as objectors who were trying to force an interpretation.
"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. ... 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." Watchtower 1981 Mar 1 pp.24-26
In 2012, the Governing Body completely contradicted itself with the new claim that they alone represent the Faithful Slave.
""Who Really Is the Faithful and Discreet Slave?"
... From 1919 on, there has always been a small group of anointed Christians at the world headquarters of Jehovah’s Witnesses. They have supervised our worldwide preaching work and have been directly involved in preparing and dispensing spiritual food. In recent years, that group has been closely identified with the Governing Body of Jehovah’s Witnesses." 2012 Annual meeting jw.org 10th Nov 2012.
