"It's not going to stop, Hanamura. The timeline thing's the easy part."

Yeah, and how do you think Naoki feels? He's at his best when he has something to do, when he's held accountable - and no one did that but Kanji. He can't imagine trying to get through the last year without even that.

(For what it's worth, Hanamura wasn't completely on the sidelines - he had crucial information at one point, and ran interference so they had access to the TV. But after what happened when Satonaka insisted on rescuing her best friend, Kanji didn't want to bring another person in who wasn't prepared.)