The reasoning of your argument TFG is sound. The Biblical instructions are to ignore words from the dead. This is a good piece of human wisdom since it is a fact that the dead cannot speak, therefore dead men's words are going to be a hoax.
To imply Rutherford, Franz et al are influencing the GB today is risible and without consequence like most of JW teachings. When you consider it, it's a matter of prideful conceit that they should link themselves to the former WT leaders. Where the hell is there evidence for this statement? Ideas which cannot be proved have no use except in brainwashing and conspiracy theories.
However the governing body play fast and loose with their followers to the extent that they feel they have the absolute right to determine what is truth and what is not. They have elevated the value of their words above all else, they claim exclusive insight into the true interpretation of everything spiritual (ie invisible, un-testable, unprovable) What gall! What hubris!
Personally I don't think they are an evil source, rather a bunch of deluded loonies milking the Watchtower tradition of cult obedience for all it is worth.