I think each GB member only sees a portion of things going on in the Society, so any imperfections or issues that aren't being taken care of, they probably have the same thinking as the rest of the JW's - that is - God will take care of things in His time. I'm doubting that even a fraction of them are knowledgeable of the WT's history, Biblical discrepancies/errors, or misquoting sources in the articles. Do you think any of those men ever go near a computer or internet?
I don't know how they can believe they are guided by holy spirit and I wonder how they can change "understandings" and not have doubts themselves when it's apparent that they are only making guesses, reverting to old understandings, or inputting personal opinions. It seems ludicrous. But if it's the only thing you know, then it's amazing at what you can get accustomed to. I was basically raised in so I'm still shaking my head in bewilderment at how I accepted things for so long without knowing any better.