I think you are trying to establish that by using a long lived, or short lived generation member , either in Joseph's oe Franz's time, David established different time envelopes. Wt writer were probably appalled that the 'older than Franz" scenario would kill the urgency by ending in 2075. The Joseph generation details would be very vague, a weak argument, as they are in the wt quiver.
The 1914 generation is dead, dead wrong, because it is now the anointed, and will pass away.