Board Thread:Questions and Answers/@comment-11927664-20130730160308/@comment-1387259-20130805164234

K3npachi wrote: A lot of people noticed the resemblance of Ichigo to Kaien early on. Kubo knew that and made Isshin the Uncle of Kukaku, Kaien and Ganju to explain it.

>Implying he didn't plan it from the beginning.