The WTS has always operated on a ever changing highway of information from the earliest days of CT Russell and his belief in Pyramidology to Rutherford making up a fictitious date on his own such as 1925.
In reality the light got brighter by the very fact that the light was never there for the IBSA and the Watchtower Corporation.. Doctrines were created more so to attract attention to the literature the WTS published on its own.
People who get themselves deeply immersed in this organization have an enormous amount of devoted respect to the executive directors of the organization namely the GB members, well that's the way the WTS. indoctrinates people to do exactly that. .
Another thing to note is that the majority don't realize that some doctrines or teachings have reversed to a previous position, they just read the present and scoop it up like its all new.
Even when the doctrines have little scriptural support such as the overlapping generation, its presented like its new light, thank you Jah for this new light.
Mind control brain washing is definitely imposed into people who are JWS., so being that Jehovah has picked this organization out all Christian based faiths, the teachings are pure and the best that man can do.
To question the teachings is paramount to question God himself and the WTS also instills a high level of guilt toward its members who might dare.