Saleen was frustrated, and both Nicholas and Jola were not able to do anything to ease such frustration. They were by no means stupid and knew that the ancient warriors could be controlled using alchemy. It was only natural for them to be able to figure out what Saleen was worried about.
Jola was a proud genius, yet he dared not claim to be able to go against ancient warriors in the tens of thousands. Those warriors would have simply made a beehive out of him. He would not have even been able to stand against hundreds, let alone tens of thousands.
Nicholas' thoughts were projected even further. If Grand Duke Iron Blood gained the power to control all ancient warriors, the Holy See would not qualify as a threat anymore. The matters that plagued his mind would be further and further away from him. Things were not looking bad for him in that regard.