[Although he notices the lack of follow-up, he can't say anything without having it turned around on him. But he notes it for later.]

I know that. It isn't... quite what I meant. [It was part of it, though, but explaining all of that would be such a mess.] I've been doing this for years, you see. But I didn't know about stealing hearts. I didn't... know anything about that.

[Akira can infer, then, at least to some extent the only thing Akechi would have known for changing someone. It was the only way Shido taught him.

Though, even if Shido did know about all of that, he wouldn't have told him. In retrospect, it makes sense. Someone confessing their crimes would have been very, very inconvenient to him. He should have questioned that. He should have done so many things different. Well, it doesn't matter now.]