I dunno. its hard to tell without the facial expressions, but when I read the dialog he and minato have, it almost feels like he's intrigued by the idea that minato is implicitly suggesting. like, the way I parse the word phrasing in my head.
kisame people, DreamShark is right. The entire akatsuki organization, from when nagato and konan and whats-his-face made it to the current day, can't be much older than 20 years (a pretty generous guess, I think). and its clearly well into the "criminal organization " part of its history as opposed to its "revolutionary group" era when kisame joins. thats definately going to put kisame's recruitment after naruto's birth.