Holy crap, I just realized something!
Could it be that the unusually quickly-replaced "New Light" came about as a result of the WT's last explanation unintentionally matching Generation 2, then changing it again once they (and countless folks on the Internet) figured out it was the same explanation, to save face?
I mean, is it possible the GB made up the last "new light" COMPLETELY UNAWARE that it matched the 1927 explanation, then changed it in an oh-shit moment when they realized not long after that they'd already used that one?