User blog comment:God of nothing/Shiba clan logic/@comment-2120712-20130429033306

I am guessing that Kaien's death and Isshin's departure are what caused the family to lose its status. You are talking about two powerful(One LT and another Captain) members gone. Such loses probably left them disgrace and any ill will towards the rest of the shinigami must of been exacerbated and what not.