I'm really glad you started this thread .... it's made me see this issue in a whole new way. It was just accepted that the 'brother' who partook didn't have anything to do with the GB, and I never really thought about it.
But yes, why are these anointed ones not advising the GB? That's a good point for my next run-in with a JW at the door. I get quite a few door-knockers now that I live in a relatively affluent neighbourhood. Usually, I just slam the door, but next time I may engage.