Board Thread:General Discussion/@comment-6440762-20130212101208

Something to think about but it says in Isshin's wiki entry that it's never shown what squad he was in because of the way the captain's haori was worn during his face-off with Aizen. But in episode 304, there's this:

http://i.imgur.com/pZNVDcX.jpg

It might be because it's a joke episode but I had to rewind and try to get a screencap of it anyway. It looks pretty close to the 11th Division when it's turned around a bit:

http://images3.wikia.nocookie.net/__cb20101224110924/bleach/en/images/thumb/4/42/11th_Division_Insignia.jpg/190px-11th_Division_Insignia.jpg

 