[No Prompto that's just a comic book thing.]

Hardly. If I had had that power, perhaps things wouldn't have gone so badly as they did.

[If he had known that that was still Ardyn, scourge or no, instead of having the revelation dropped on him by watching through Noctis' eyes, how much would be different?]

Just the regular sort of insight of being together constantly from birth to about your age.