Board Thread:Questions and Answers/@comment-68.255.45.190-20150127050026/@comment-10733658-20150206075149

From the volume 14 profile, it seems that CCG knows he fought Amon but don't believe he killed him. Likely because they know Aogiri was involved.

But I really cannot see Akira, as intelligent and good at putting the pieces together as she is, not realizing who he really is. I mean, she figured out from vague data that Tsukiyama was hiding in the 6th Ward and pursuing some major target that kept him preoccupied.