Talk:Naki/@comment-190.113.178.13-20150204222850/@comment-10733658-20150204231720

They haven't ever really explained exactly what determines their rankings, beyond some vague idea of how dangerous a Ghoul is.

What you need to remember, of course, is that Amon and Akira are both insanely strong. So them defeating him doesn't really mean much, since by then Amon had already killed two S-rated Ghouls on his own (the Bin Brothers).