Every JW (and ex-JW) that cares to think about these things absolutely know that the overlap will be extended to include anointed that were merely born before the first part of the overlap was all dead. They use Freddy Franz and 1992 as their benchmark, so that gets them easily 45 to 50 years past that date (so as late as 2042) before they have to look back at all the proof in their own Watchtowers (that they have planted in the years leading up to 2042) that the overlap did not have to be active "contemporaries" of the first part of the generation.
So knowing they will eventually go there, no JW's are even thinking about how the current FDS are really not contemporaries at all of Freddy, the symbolic end of the first part of the generation.