In 1979 the Watchtower admitted to their 1975 failure. That admission was a total of two sentences long in the back of a Wt. study article. Either 1980 or 81 Franz was in Reno Nev., so I set about to listen very, very hard to every word he said, and at the end he said absolutely, nothing! Yes he had energy, he worked the crowd but there was never a point or a concept to get across. But he had a magic word which was "hence". So he would orate then throw in the word 'hence' and the crowd erupted in applause.
That talk, 1975, the 1984 Wt. comment as to we would be preaching to son's and daughters of those "sighing and groaning" of Ezk.ch.9 and the 1984 start of the "obedience to the Organization mantra", was my personal eye opening.
It was also in Reno in 1982 and 1983 where we were told that there was no "new light" to be had . It was even stated that if we wanted "new light" then do personal study and locate some yourself. So getting back to Jeff's original point there has not been anything new as he knew during the early 1970's is absolutely right on. So using Fred's own word "hence" we have seen a concerted effort on the part of the GB to shut down minds, demand blind obedience as the closest the GB has to "new light" is David Splane's newest version on Matt.24:34.