Board Thread:General Discussion/@comment-1429792-20140920205950/@comment-8986886-20140922192306

StealthBlade98 wrote: Not sure what relevance that has to my theory on Reiatsu and how he can still perform Kido without his soul reaper abilities hence the words clearly stated by isshin to ichigo. It's relevant because I doubt that Isshin was able to use Kido -at all- in his weakened state. You, on the other hand, believe that his Reiatsu was strong enough to let Isshin use Kido, despite him being weaker than Ichigo's Human friends.

Rukia was still able to see Hollows after she'd lost almost all her powers to Ichigo, which means that she was stronger than a weakened Isshin. She's also an adept Kido practitioner, but her Hado spells had no effect when used on a Hollow which she described as "small fry". With that in mind, I find it unlikely that Isshin used Kido, strong enough to stop an Arrancar, when he couldn't even see Hollows.

I'm also not sure what was so clear about what Isshin said to Ichigo, I thought your theory was based on the fact that Isshin was too vague, and that his words could be interpreted differently?