The question posed in the opening Post is one I asked a number of JW's over the years. I had to add the word "unique" in front of the word Doctrine, or they would simply list things that other Christian groups teach, but it would be necessary for them to have at least one unique Doctrine then, that is still taught as truth today, for Jesus to choose that little band of Rutherfordites over far more suitable groups,
Of course, there is not one such Doctrine. I went through this whole argument with one Elder, and after it all he said " Well I think there is enough proof to satisfy me that Jesus chose the J.W's ( as he called them, a name that came later) in 1919". I asked what that proof was, and I won't bore you with the very weak argument he gave, but in the end I gave up.
I am sure that by asking the question of a good number over the years I have planted seeds, I hope so, but Logic, Reason, Facts and Truth do not matter to those Mind Controlled by the Cult.