Fisherman
Nobody is until they come out of the gt.
You've hit the nail on the head
Jehovah's Witnesses (Since 1970) have justified the notion that the great crowd could be identified as "prospective" members prior to the millennium via the idea that “time of the end” would not exceed the lifespan of a single generation.
They assured everyone that the “great crowd including many of the earliest members thereof” would live to see the “great tribulation” and therefore had the prospect of surviving it.
I’ve cited an explicit example of that teaching already, but there were plenty more (Which I can quote if you want)
The chronological understanding of the 1914 generation was done away with years ago, but it persists in the great crowd teaching which has never been adjusted.
Modifying this teaching is not as simple as seems at first glance. For example, do the “Other sheep” wash their robes and make them white in the blood of the lamb? Do the “Other sheep” benefit from the Ransom prior to the millennium? These are all things the Bible (Again, as JW’s interpret it) says specifically about the “great crowd” and no one else.