"After the year that has elapsed since the article was published, however, the authors no longer agree about the events theorized in their article. Firestone's reply is printed below. Topping declined to respond, pending new experimental data."
William Topping has responded, but not soon enough apparently to make the Mammoth Trumpet's cutoff, and if fact was never posted there. Found it HERE(much of his counter-rebuttal to Southon/Taylor's rebuttal has been included in the article this thread is based on).
I didn't read it closely enough to see where Firestone and Topping may have parted ways(if in fact they did); a little technical for an old salesman ;^)