Board Thread:Questions and Answers/@comment-25801533-20150531094407/@comment-25801533-20150602031116

You are right this is difficult. Now i don't have the official character book but on Kaien's page there is a reference to the book

"Kaien values friendship above everything else. His spirit of kindness lingers on today." - picture caption by Tite Kubo[1]

It is something to note i suppose.

But is this what Byakuya was speculating about as Ichigo was about to unleash his "bankai"