For many decades, it was taught that selection of the 144,000 was completed and sealed--depending on who was the Big Cheese deciding these matters:
Thy Kingdom Come p.362
"Let God be True" 1946 ed. p.298
Watchtower 2007 May 1 p.30
In 1935. After this announcement, the number of memorial partakers steadily declined. This was presented as proof that the end would be soon.
If you stop and think about it, Confirmation Bias leads JW's to look for certain results in order to confirm their hasty certainty. What they get is only what they choose to measure.
Knorr pried the conch shell (Lord of the Flies reference :) from the cold, dead, hands of Rutherford and instituted a proprietary Paradigm shift of his own.
Knorr and Franz wanted to get rid of Hayden C. Covington as the V.P. and the scheme they came up with involved the question of "anointing" and anointed. Who was and who wasn't anointed as well as what specific elite could and couldn't do.
When the Society changes attention, focus, measurement and doctrine, the result is a shift in the balance of the Force.
Internal change=external vairance.
There is always a Spin or cover story!
If anyone since 1935 rightfully claimed to be anointed it was as a replacement of a sinful remnant, no longer worthy of heaven!
"For 19 centuries there was only the one calling, the heavenly one, with Jehovah being very selective as to who would serve with his Son to make up the Kingdom government. Many would be invited but only a precious few chosen. (Matthew 22:2, 14) In time, the prescribed but a limited number of 144,000 would be reached. After this no more would be anointed by holy spirit as a witness that they had the heavenly hope, unless, in a rare occurrence, the unfaithfulness of one of the remaining 'chosen ones' made a replacement necessary." Watchtower 1982 Feb 15 p.30
The Watchtower Droogs signal the response they are looking to measure in advance:
"Over the years some, even ones newly baptized, have suddenly begun to partake. In a number of cases, after a while they acknowledged that this was an error. Some have recognized that they partook as an emotional response to perhaps physical or mental strain. But they came to see that they really were not called to heavenly life. There is every reason to believe that the number of anointed ones will continue to decline as advanced age and unforeseen occurrences end their earthly lives." Watchtower 1996 Aug 15 p.31
It undoubtedly annoys the hell out of these Masterminds when the throngs of the great unwashed disappoint their clear instructions!