Good work!
The 1914 obsession of the WT can never be fully understood until you realize this was THE mechanism by which they stole peoples' salvation by mean of the New Covenant.
By time warping everyone and getting them to believe that the gentile times "church age" had ended, they then began to make the argument that it really wasn't disobedience to Jesus to reject the New Covenant at each Memorial ...for general members. The heaven vs. earth destination they harped on, is a non-issue as it pertains to Salvation from judgement.
Since the New Covenant (blood covenant) guaranteed salvation, and since the JW's were no longer open to accepting Jesus' offer, the "need" arose for people to work for their Salvation instead of just accepting it like previous generations were able to do.
The Watchtower was all to eager to step in and provide for this new-found "need" for salvation.
What a happifying provision that turned out to be..... not.
The really ridiculous thing is, that the tribulation saints (and yes they are a different group than the Church-Age Beleivers) are still declared righteous by the exact same means as previous believers were ... by the blood covenant.
The great crowd washed their robes and made them white in the blood [covenant] of the lamb". - Revelation
But, by getting people to believe that they were in a future group spoken of in Revelation, they were able to build on this difference and argue that Salvation was also by a different means.
"I am the way, the truth, and the life. No man cometh to the father but by me" (The New Covenant) - Jesus