From reading this board, I think Barb Anderson is the person you want to talk to. I think she was the closest to that inner circle you are wondering about.
I didn't really interact directly with the GB except for that time Brother Sydlik took my seat during morning worship. Most of the new GB members are all former District Overseers who were asked to work for the branch and then invited to the GB. I'm pretty sure being a giant controlling, stone cold asshole is the key requirement to being a DO, so that should tell you about the new GB.
Your last paragraph has a lot of questions and I'm not about to write 50 paragraphs to answer