In order to accomplish the preaching, teaching and disciple-making work before the conclusion.
This is something that I just don't seem to follow your thinking. You say the apostasy from the MOL that is the operation of Satan, is the 'declaring that the parousia has begun and the day of Jehovah is here'. You also acknowledge that that has been being declared starting with Russell and continuing on down to today. So, how did they become apostate when that teaching was always present from them from the beginning?Well, there is anecdotal evidence; the fact that the core truth of the Bible is published far and wide, and an army of ministers has scoured the earth preaching the good news of the Kingdom. And you can reverse engineer it; meaning, since there will be an appointed slave on earth when Christ comes to initiate the judgment and events appear to be winding up for a global holocaust, and the Watchtower has become apostate with what fits the profile of the evil slave beating his fellow slaves, and...
You can't scripturally point to when and how Jesus appointed them but nevertheless claim he did. (They don't even make that claim about themselves.) Regardless, let's say he did. Whenever he did it would be at a time that they were 'declaring that the parousia has begun and the day of Jehovah is here', because there was never a point in time that they were not declaring that. So, Jesus appointed a group of apostate people knowing that that was what they were teaching and would continue teaching?
Also, do you really think that if the Watchtower didn't make the claim about 1919 that there would be a Watchtower today? You said, 'Sure there would'. But how could that be, they would have no basis for claiming that they are God's channel over all the other religions. They would have to just say Jesus appointed us, we don't know when, but he did, just trust us about that.