Good question, but I can't add a reply to your OP.
My statement would be this - "If your Governing Body is God's direct channel of communication on earth, why did God use Babylon the Great to reveal a 'new light' to let you all know that the 'evil slave' isn't real, it's "hypothetical"?
After which, the WTBTS plagiarised the idea and presented it as a "new understanding/clarification" in their Watchtower magazine.
Please read the NET BIBLE at Matthew 24:48, then read the footnote.