hmm.
much is still unclear about these panels imo. like why is he saying they couldn't kill him? surely he's not immortal. that's weird.
however, if doffy's father didn't know, HOW did doffy find out?
i'm inclined to think that his father DID know but deceived the other celestial dragons, convincing them that he had no idea. in truth, he knew everything and shared the info with rosinante and doflamingo. i just don't see how doffy could ever get access to this information otherwise.