User blog comment:Salubri/The Battles and Overview/@comment-1706259-20100210211224

You're wrong about Isshin.. when Kisuke was talking about how everyone is getting prepared for Aizen sama and his arrancars; he mentioned Isshin mobilizing also.. to which Isshin didn't disagree to.. thus it can be said that he plans to join in the massacre. You do have a point on Ryuken though.. but if you think about it.. there is no way Isshin would let his son take on one of the most powerful shinigami of all time and just stay home and do nothing..