[xaisen]

Spoiler:

i had an idea that ichi's dad was the ss king and was just in the livin world to stay safe or somethin, but the most plausable idea i've heard here is that he helped urahara and got banished for it and had his shinigami powers sealed/taken away because in the anime at the moment didn't ran'tou have her shinigami powers sealed away because she helped the bounto... he probably got his powers back to help fight against aizen and his guys since that WAS about the time they started to attack and got his powers back they also needed help if i'm not mistaken. But no i dun that kiaen and isshin are related

anyway that my view on it