I keep asking this question when this topic comes up: Why does it matter when Jerusalem fell?
1914 is not based on the fall of Jerusalem. Just because Nelson Barbour thought it had to, does not mean that Jehovah God thought it did.
The problem is that people rely on books like 'the Gentile Times Reconsidered" and are just as lost Rutherford, Russell and Barbour. Carl Olof just wrote it to argue against the Watchtower Society because he is so arrogant. He didn't write it to find the fulfillment of Nathan's prophesy to David to find when Jesus would become king.