I pulled a few damning statements from the JDubya cd.
A WT contributor in April 1881 named J.H. Paton wrote that the leaven illustrated the glorious success of the work. In WT's of 1900, 1910 and finally in 1975 his assertion was roundly condemned in strong words, concluding, ". . .the argument used by J.H. Paton in April 1881 does not hold good. . .the parable is not an illustration on the positive side."
As commented above by earlier members today's "lesson" was a complete reversal of what was taught as "truth" by WT for the last hundred years or so.
I wonder how fast the current governing body would be booted out as apostate if the old regime were still around?