Don't overlook that they drink their own koolaid. Just like most good salesmen, they believe their own hype. They spent a lifetime of indoctrination and climbing the corporate ladder. Whilst they are more aware than most of the faults with the religion, they have more to lose than most, and hence suffer cognitive dissonance even moreso than the average JW.
I think that is the case. As an Elder, I truly believed it all and believed that everything I was doing as a loyal JDub was God's Will. I believed we (JWs) had been given special insight and understanding of all these Bible prophecies and their secretly veiled outcome that had only been revealed to US. We were SPECIAL. God's People.
I'd like to think the GB have this same delusion and are not devious con-men.
However it would not surprise me that there were some in very high positions that have come to realize TTATT. (Perhaps Service Dept since they likely receive all the sincere letters and explanations from many who have first discovered TTATT and write in seeking info.) But, they have to continue to "play the game" or their entire lifestyle would be flushed down the drain and they would be cast out with nowhere to go.
Surely those in the Writing or Teaching Committees who have done the "twisting" and outright misrepresentation of quotes must know it is all bogus, for why else would there be the need to twist and distort?
And certainly the educated people in Legal must be aware of the "facts". I suspect much of the Blood Doctrine is controlled by Legal to prevent a deluge of litigation.
Doc