Tonus outlined it nicely. It's how pretty much every organization handles its back peddling and change of doctrine. The JW's are late to the game, the RC church has been doing it for centuries. Take Joan of Arc for example. Oh, she's possessed, she wears men's clothing, she fights. Burn her at the stake. Wait, er, perhaps not, actually she was a little bit of alright. Scratch all that, she's now a saint of the church. The RC church has its own version of "new light" as do most other denominations that have been proven wrong on evolution or young earth theory or fill in the blank.
You go away from it for a while, then come back to it with a mea culpa and all humility and of course God wasn't the problem, it was us sinful, foul, bone headed creations that once again got it wrong. Too bad, so sad, now let's carry on and hope we don't fall into such error again.
1914, it's just a number to be explained away.