Kisame considers Naoki, amused and pleased. No protest, just acknowledgement. It's either a sign of someone who's given up, which Kisame doesn't think is the case this time, or who knows where they need to improve and how to get better. The second case is very good, and he nods slightly before answering the question.

"Wild tiger sharks can get up to five meters. Because she's a summon she'll get anywhere from twice that to five times that, but that will probably be a century or so off, and she'll spend most of that time not much bigger than her wild cousins."

She's a good summon, and Kisame is almost wistful about the fact that he himself won't live long enough to see that growth.