"Indications as to the meaning of symbolic terms....are found in the rest of the Bible" They claim to let the Bible provide its own explanation.
Then they go and tell the world the meaning of the very symbolic "faithfull and discreet slave", do they show where their unique interpretation gains support anywhere in the Bible ? NO.
They are masters at doing this, I remember in the Rev Climax book they set out what sounded like a reasonable methodology for interpretation, and then proceeded to break the rules of what they had set out within two pages !
They are taking the piss, the writing department must wet themselves when they do this, they know that if anyone is recruited using faulty logic like this they will never question any Bull***t they are fed, like the 7million brain dead already in the cult.