Providing proof that this happened should be incredibly simple, straight-forward and second nature to all Jehovah's Witness.
Why am I still waiting for one shred, then?(JW apologist in question as removed their attempt to broach this subject)
* Jehovah's Witnesses start with the presupposition that Christ returned, invisibly, in 1914. From this presupposition comes the belief that Malachi 3:1 was fulfilled in 1918 when Christ returned to "his temple" and undertook an inspection of all Christians on earth at the time. His satisfaction with the Bible Students, a sect of the Adventists, led by C.T. Russell, himself a failed haberdasher, was such that he selected them to be God's only channel of communication on earth, the "faithful and discreet slave" "class".
This presupposition assumes the following unique teachings of Jehovah's Witnesses to be true;
- Christ returned in 1914
- based on that date, Christ inspected all of Christianity in 1918
- Matthew 24:45-47 applies to a "class" of Christians
- that "class" of Christians was found only within the membership of the Bible Student sect
Obviously, only Jehovah's Witnesses believe these things. They do so because they are taught them by the Governing Body, which itself claims to be the 'voice piece' of the above mentioned "faithful and discreet slave" "class". The reason Jehovah's Witnesses believe what the Governing Body teaches them (the afore mentioned unique beliefs of Jehovah's Witnesses) is because they believe in the above 1919 selection of the Bible Students. And the reason they believe in the 1919 selection of the Bible Students is because of their unique beliefs, including Christ's return in 1914 and his subsequent inspection of Christianity in 1918. And the reason they believe that....
By now you can hopefully see the circular logic that keeps faithful Jehovah's Witnesses blind to the truth: there is no proof for any of this (JW apologist in question as removed their attempt to broach this subject).