According to David V. Barrett, author of Secret Societies: from the Ancient and Arcane to the Modern and Clandestine, states that one of the characteristics of a secret society is that : It has "carefully graded and progressed teachings."
----
JW bible studies with outsiders seem to fit this pattern.
I find it odd that the uninitiated person is referred to as "the study". It seems that the book should be what is being studied.
Actually, it is the person themselves being studied or scrutinized to determine if they are compliant enough to be JW material.
This is the initiation; this shows that there is a selection criteria.
The bible study program appears to be a requirement to attend the KH, rather than an option.
The KH is not a place where you can easily "fit in" without the indoctrination procedure. I would also venture that most people do not even attend a KH without having first had a bible study lesson(s) with JWs and an invitation to attend KH.
Questions outside of the material being presented is not much appreciated. It throws a kink in the speil. The "lessons" are indeed "carefully graded and progressed".