User blog comment:Salubri/Final Fight: Reflections of an Unrealistic and Ridiculous Battle/@comment-1706259-20100129165742

I think that Nanao remaining in SS and Isshin being absent is an important point that is being overlooked. If all vice captains are in FKT.. why would Nanao remain in SS? There has to be some crucial reason for this, also I don't think that Isshin would leave his only son to fight someone like Sosuke while he just relaxes in Karakura town..sure he said he wasn't at full power.. but some time has passed since he was revealed to be a shinigami.