Because the anointed are the wt generation, they are supposed to pass away, Prologos
Given: WT theology
They do, wt always taught that rapture means passing way in the twinkling of an eye AFTER they see the final part of the sign. But the destruction is not the sign or part of the sign. The destruction is what the sign points to.
It is the OS, prospective members of the GC, a constantly overlapping generation ,
The great crowd of other sheep cannot interlap. First of all, they do not pass away, they survive, and second of all, each dude as an individual expects life in his lifespan which means that the oldest gc member should not be destined to die of old age.
It is all Greek to me sort of speak, but the way I interpret "...generation not passing away until.." simply means that the prophecy in its entirety should fulfill in 70-100 or so years or the maximum lifespan of anyone living at that time. WT overlapping doctrine only adds 20 years. 2016, time is up.............................