He who defines the terms, controls the argument. So you are right, we have to establish what the WTBTS said a generation was. It's been answered several times. THE GENERATION were those anointed who witnessed the events of 1914. That is the original ,"truth." Those persons were used as a living timeline. They were getting old and were not going to die. That was the proof the END was SOON.. What more do you need? Everything else beyond that old "truth" is pure spin. The false teaching reached it's expiration date and the WTBTS leaders swiftly "adjusted" it.
I am not angry. Do I sound angry? I am more saddened and frustrated than anything. The legalism in the ORG is terrible. The people are fixated on the physical and material. The ORG is the golden calf of the rank & file. It's sad because it can all be fixed if the leaders want to do it. So far they are showing no signs of stopping the train, and the bridge is out.
DD