Cor was just about to admit to Cid that he's right when he heard...

No, that can't be. And yet, he's sitting up straight as soon as he hears that voice. whirling around to find the younger man standing there, like he hadn't just gone off to Altissia with Noctis and the others.

"...Gladio? How did you...why are you here?" And why is he not with Noctis and the others?