Where you seem unable to grasp the point is that even taking the above into account, should the GB change their mind on the interpretation of the Bible command then the conscience and decision tree of an individual Witness will change to match the will of the GB.
JW know that wt doctrine has changed and can change but also believe that gb is the FDS and as such GB decide doctrine and lead JW and JW follow.
If a JW believes that the gb are only a bunch of men dictating policy as you say, then why should he continue to be a JW?