Cor's not surprised that Ignis would make a thorough assessment of the situation. And to be honest, he's a little calmer due to the idea that Ignis did consider taking over the airship, should push come to shove. But only a little.

"...still, the fact that he's managed to corner you into accepting his help is rather concerning, even if the airship was that lightly staffed... It's almost as if he was manipulating you four."