They may not all agree on the details
PZ right, but it is on these doctrinal details that wt classifies almost all past believers (except ~ 80 per year) to be false worshippers deemed to be doomed at that, their time.
When 30 % of the population died in a medieval pandemics there was better reason than the 1914 overlapping generation groups to believe, that the end with apocalyptic horsemen was near. Millions died but only 80 made it to the wt resurrection in 1918.