By its own mandate in the founding of the Watchtower magazine in 1879, it was set up to proclaim the arrival of JC in the heavens according to the then currently failed Adventist claim for Jesus' return the year 1874.
Russell's catalyst for all that came afterwards was his pet claim (in so many words) "aha but JC did in fact come... but came invisibly!" He added without sound evidence that it took four years for JC to come to rule from the heavens after his arrival there and that then was said to be in 1878.
Within forty Biblical years from the arrival date, Russell promised, with hopes even higher than his bank account, that God’s kingdom with Christ at the helm would rule the Earth in the absence of all worldly opposition. Opposers would all be dead and destroyed by 1914, which would be the grand visible effect of the heavenly kingdom. Religious words and hope are proved to be cheap and cheerful... but worthless.
The abject failure of this wild speculation did not stop the rot. The entrepreneur and showman Russell was personally distressed at first by his error but the WTBTS as we are all too well aware, kept postponing the crazy beliefs and pressing them before the hopeful readers. "It’s coming very soon!” was the doomdsay merchants street cry. But the business department noted that this baby was making a mint of Dollars so why stop while there are suckers who want it?
I suggest that there is no evidence whatsoever that God’s spirit (a bizarre and unprovable concept in itself) could be upon the Watchtower organisation.
If the Watchtower is God’s mouthpiece and the "end time" its key doctrine; how could Holy Spirit repeatedly get the dates and the events always wrong, resulting in total failure during the whole 136 years of its 'divine' prophesying?
What conclusions can we draw?