Knowing it's b.s. and arriving at not believing in God would be a huge jump. It is possible that I have overstated above- perhaps their reeducation convinces some that Jehovah is using the other 11 guys (or whatever number they are/were on) and that the single member doesn't quite feel the Holy Spirit the way the others say they do, but is still afraid to say so. In that case, the same result- he stays quiet and casts his votes and shares his opinions based on what seems best for the salvation of the organization.
Gee, for a second there I could not tell if I was reading an opinion of the GB or the Emporer's New Clothes fairy tale! To paraphrase, it sounds like no one wants to say that the emporer has no clothes Watchtower Society is not spirit directed.
I would imagine there are some among the GB that long for the old days of warm fuzzy ignorance to the reality of running a major corporation.
In other words, they've seen the man behind the curtain and pine for the days when the wizard is a wizard who will serve Jehovah is guiding the faithful slave.
To give my two cents, I suppose that if they still believe then they believe that God is helping them make their decisions. Much like leaders of a church or a small Christian group at a college (like I was a part of) they probably think that if they 'prayerfully' consider their choices (and I bet they do pray before their meeting starts) then Jehovah will work it out. Even when things mess up they probably believe that Jehovah will work it out somehow. Confirmation bias I'm sure but no different than leaders of other churches. Of course, there maybe those who secretly do not believe in either the doctrines or the Bible but they may just be going through the motions or even hoping God will reveal all things in due time though there may be some 'atheist in the pulpit' also or even some charlatans.