When it comes to cults, Jehovah's Witnesses have a very strong hierarchical leadership system. In many ways it enforces their control on the individual. One of the tricks is that the lower levels of followers never get direct contact beyond the circuit overseer level. They know who the district overseer is, because they see him in the circuit assembly or at the district assemblies, but they usually can't talk to him. The zone overseer is rarely seen and bethel is a big mystery. And then after bethel comes the highest level, the governing body. Most JWs don't know who is in it, their names, for how long, or any personal information about the individuals that make up the governing body.
As a cult leader the governing body is in the best position possible. They don't even have to face their followers. They are anonymous. Whatever mistakes they make can be scapegoated down the chain of command. There is no way for lowly followers to contact them. In the worst case scenario they can even scapegoat one of the GB members. They are immune to criticism of a true believer. How can you criticize somebody you don't know and you are not even sure what they do? Most JWs don't even know how they get appointed or how to become one if they wanted to. Because of the great mystery surrounding them they become infallible. They are an invisible target.
This strong position also means that they fully control the information that reaches the followers. As a cult leader in small group, you have to interact with your followers personally, and they might see you when you are not at your best or catch body language that indicates you are not agreeing with what you are saying. No such problems for the governing body. Only what they want to say gets communicated and only when they want to. They leave out much information that would intrigue their followers, for example, how they get new light. They never have to answer difficult questions. They are fully in control.
Because of this they are able to make many statements without explanation. When they say that overlapping generations are divinely inspired, how are you going to factcheck that? You can't. The only explanation they have is that the holy spirit is guiding them through prayer. More vague mysticism. They are hiding behind the bushes, with a big megaphone shouting out commands. It doesn't get any more man-behind-the-curtains than that.
When the watchtower society decided to draw power away from the big-name presidents such as Rutherford and Knorr and anonymize the leadership, they made a very important and powerful change that would tighten the grip on their followers.