I have not read all the posts in this thread, but to make sure we know what the JW really say…. this from the margin notes of the online NWT
”
Matthew 24:30
the sign of the Son of man: This sign is not the same as “the sign of [Jesus’] presence” mentioned at Mt 24:3. The sign mentioned here is connected with the “coming” of the Son of man as Judge to pronounce and execute judgment during the great tribulation.—See study note on coming in this verse.”
In other words that verse means Armageddon, not 1914