Board Thread:Questions and Answers/@comment-6207546-20130504124857/@comment-25032153-20140702130144

Isshin was like didn't get out much in when he was captain as it was shown in his flash back that he sleep'd a lot and eat alot though he was a captain he didn't do anything but talk to the second and 3rd seat all day. So if you take that into account Kaien which was a more out going person was it's most notable member because of that.

though Rukia's brother mentioned that the captain and bankia and the people that are known to do Bankia have their name ingraved in the history of the Soul kingdom. But as well see in the flash back Rukia was found by her brother in a year of going to the school through she did finish she was placed in a squad and giving a non seated officers place though her captain in the finding of information she was not tolled any names of the Shiba clan she had to find out later who the family was so if she was in the dark about that but had ganeral knowledge. It would be find if she over looked that Isshin and Isshin shiba looke dthe same but had a different last name but couldn't link them together as he same person as she had no knowledge of him or his looks just a name.