I think I will need to read the book to answer your first question. The diagram, while interesting, is not entirely self explanatory.
To your second question... this is a big one. There is much posted on this site already about witness history and how some doctrine changes have be hidden or buried; and how the witnesses explain their constant flow of new doctrines as "new light" and "food at the proper time". Perhaps someone else can elaborate on this or provide some links?
oh yes, and how you would be disfellowshipped now for holding the beliefs that the witnesses had a few decades ago.
Question 3. errrr... nothing.