The art of the GB is to make a perception of believability, it their duty to spin the table of knowledge as needed when it's required
there is allot at stake as this is their livelihood and privileged stature in the organization, so don't be too surprised that they are going to hang around for awhile yet.
I personally farted out their mindset ideologies 30 years ago and I've never felt better.
Watchtowers always gave me indigestion, anyways !