User blog comment:DashingSword/Chapter 397/@comment-1337270-20100326182327

Yeah I beleive both of thier History will be explained here. Aizen has to know something that no one else knew in order to have such an elaborate plan. And I beleive that Isshin knows exactly what it is and he has been keeping a secret from Ichigo since birth. My theory is Ichigo mom was part of the Royal Family! Fell in love with Isshin and they had to leave the SS in secret and hid in the real world so their family would be touched. You know a forbidden love type deal. Ichigo being born of a shinigami and Royal family blood was not allowed so they tried to keep him hidden but with Aizen having known Isshin he also knew of Ichigo's birth. So he manipulated everything in order to develop Ichigo into a powerful being for his own personal gain. Just me spazzing in the brain!!!!