I would take exception to a couple of statements made in this OP however others might disagree.
Page 9 of this book says this: "Charles Taze Russell, founder of the Jehovah’s Witnesses
I would argue that C.T.Russell founded the "International Bible Students Association" not the Jehovah`s Witnesses ,C.T. Russell never identified himself as a Jehovah`s Witness .
J.F.Rutherford usurped the followers of Russell after his death and he was the founder of the Jehovah`s Witness religion stating that they would now be identified as Jehovah`s Witnesses.
When Russell announced to his congregation in Brooklyn, New York, that the end had begin, he meant the finale was not an instantaenous end to all things, but rather the beginnign of the end as outlined in the Book of Revelation - the appearance of the Antichrist and the harlot, Babylon the Great, being two of the key events.
I believe that is bullshit ,Russell initially believed that 1914 was the end of the known world and that all the Faithful, his followers would be in heaven by 1918-19
Just my take on what has been presented in the opening OP without looking at the links and I stand to be corrected in what I have stated