I understand what you're saying, but respectfully, I disagree. My child has her own life but was born of my womb. Without me, she wouldn't exist.
Without Seventh-day Adventists the International Bible Students possibly woudln't have existed either. And without the Bible neither would have existed ... you get the idea.
My original point was there was a split early on, the IBSA went one way, and the "Jehovah's Witnesses" went another. Just like there was a split between CTR and Nelson Barbor (http://en.wikipedia.org/wiki/Charles_Taze_Russell#Split_with_Barbour).
Showing a current day Jehovah's Witness the Pyramid stuff would be like showing them Seventh-day Adventist documents from the late 1800s. They both mean nothing, and you'll probably get a blank stare and denial.
In my opinion you'd be better off focusing on modern day Watchtower blunders, or doctrine that links to that era (i.e. pyramid lengths 'proving' the year 1914).