I don't know. Maybe I'm naive or just plain stupid, but I believe what the mystery Bethelite says. Also, I don't think it's out of the ordinary that Mary was concerned about going to the bathroom in the Kingdom Hall.
Remember, the elder at Bethel who was arrested because he took pictures of people using the bathroom? That was hard to believe but it was absolutely true. There have been homosexual rings at the Bethel Home and pedophilia at the Kingdom Halls. Can we just dismiss out of hand what the mystery Bethelite has to say?
Remember, not all of these men are godly men. This is not the same organization we knew 20 or 30 years ago. This organization is a whole new animal run by neurotics, control freaks and attorneys. I wouldn't put anything past them.
Of course the mystery Bethelite's story is incredible. So that? Does that mean it is unbelievable? Not at all.