The possibility of Sheckel advancing to rank 5 was big news to the Ivory family. It was so important that the patriarch was informed.
The Ivory family didn't want Captain Sheckel to advance to rank 5 at all. It is unlikely that she will continue to serve in this town and more likely that she will be transferred to a city. But they are not willing to risk it.
If she doesn't get transferred when she advances to rank 5, it goes without saying that the lamp bearers will be able to pressure the Ivory family even more than normal. Their plans won't work with such a powerhouse in charge of the lamp bearers in the town.
Even if she is transferred, a new rank 4 captain will be sent to replace her. That means most of the information they have accumulated about Captain Sheckel will go to waste. They don't want to see that happen either.
So the Ivory family began to feel pressured. They began debating if they should give up or advance some of their plans now.