In my mind, one question easily defeats their false analogy.
Who was guilty of "leaving Jehovah", Saul or David?
If it was Saul who left through his corruption, then obviously Saul's physical location was unimportant, but his actions were. So even though Saul may have lived at the World HQ of his day, he had abandoned God.
If David stayed with Jehovah, then it's also obvious that a physical location is meaningless. Whether David lived in a cave, or a tent as a fugitive, he never left Jehovah.
Biblically speaking, no XIAN can leave God by ceasing to visit any physical location on earth. There is no temple where God dwells, therefore it is impossible to leave him by leaving any sect or denomination that is corrupt on any level. Like David, the WTBTS's go-to hero, you are simply removing yourself from a spiritually harmful, life threatening situation.
This "as a whole" business is pure BS.
Just thinking out loud here, would the WTBTS Inc., ever burn a higher-up to "prove" that corruption exists? Then they could say that they are cleaning house in these " Last days" and come out looking better. After all, they just had a very ambiguous WT study some months back, and it dealt with apostate infiltrators. It would be a great "We told you so." angle to use. I would DF Loesch as an example for all. What better way to show that Jeehoobie will not tolerate disobedience, and that Jeehoobie's Org is the one true corporation??
DD