King Rex had already met with the only female Shadow 'King' of the Eld Enclave before having his conversation with Satov. While Rex and Satov sealed the deal, she was in the midst of preparing the spells to protect the remaining portion of Demopolis for the next phase.
Honestly, he had not expected Jin's rich resources to be so easily accepted by the Shadow Kings but it had proven that their intelligence gathering had been on point. Through the constant eavesdropping, the goblin communications team had successfully managed to figure out the desires of each head of the three major Mafia factions. It was not an easy feat but the completion of this particular task had further shown Jin's War Council that information gathering and manipulation was indeed as important as the strength to fight off their enemies.