Ignis sees how it is. He is so gracious as to stay silent on the matter regarding how Cor looks, seeing a gem so reminiscent of someone, but that is apparently in exchange for learning more about things Gladio gets up to within the next ten years.

There's no particularly explosive outrage, because that isn't how Ignis tends to work, of course. Just a small exhale of perhaps annoyance, and then he looks away.

"Is that related to the new scars on his face, then...? Although he did tell me about one that involved him taking a blow for Noctis. I should have pressed on the latter."

But maybe he was more impressed with the one that involved protecting Noct, so everyone can just shut up, ok.

"...I take it that he did at least emerge victorious from a place few ever emerge from at all?"