After all, they had already formed a cooperative relationship with the Tower of Dusk where the latter's well-being concerned theirs too. As long as the Tower of Dusk was still in dominance, they would definitely be in control of the negotiation with the Gilded Kingdom too. If the Tower of Dusk was at a loss, the Gilded Kingdom would definitely have the upper hand during the negotiation.
Of course, not all of them thought the same way. For example, Joseph and a few other representatives who were afraid of trouble did not appear among the crowd.