Interesting, why do you think Mizuiro?
He knows way too much:
-Remember what he said to Shunsui?
I remember a soldier calling your named during the chaos.
But if you think about it, doesn't that sound a lot like
some guy told me exactly who you were despite the fact that you're now wearing a flower draped Haori, an eyepatch and a strawhat which would completely change your description at the end of the 'Winter War'.
'Cause in all seriousness, if someone did say his name, the most they'd say is
Help me Shunsui Kyoraku, captain of the 8th Division!
Furthermore, the way Mizuiro said it, seems that he heard this:
Help me Shunsui Kyoraku, captain of the 8th Division, wearer of straw hats and pink flower kimonos!
which I can never see ebing said. :|
However, the funny thing about that is Mizuiro and his friends were all in the real Karakura Town (in SS), whereas Shunsui was in the the Fake one. Meaning there's no way there'd ever be the need for someone to call Shunsui out for help, especially if they're in different realms. (o_____o)
Lastly, the starngest part to all this is the fact that in the 'Official Character Book SOULs', a part of his description says:
"He has a cute face, but he's actually a ????" *So as of now, Tite Kubo has still kept us in the dark as he has yet to say anything that blanked out word; leaving it unidentified*