Board Thread:General Discussion/@comment-7779702-20130404000656/@comment-5398287-20130404150046

That wasn't a Reiatsu wave. That was an example of how strong he became after taking off his eyepatch - his slash traveled farther than the blade itself, if that makes any sense. While in Bleach: Soul Resurreccion he can actually launch Getsuga Tensho-esque waves of Reiatsu, even the anime didn't show any Reiatsu coming from his Zanpakuto, so it wasn't a Reiatsu slash.

Anyhow, back to the topic. As for Isshin's Zanpakuto, I wouldn't be surprised if instead of just constantly bathing it in Reiatsu, it always has a Getsuga Tensho prepared. If what I'm saying doesn't make sense, remember back when Ichigo fought Ulquiorra for the last time, where he kept his Getsuga Tensho in his blade to enhance his attacks? Yeah, now imagine that all the time. Not saying that's what it is, but it would make sense with the appearance. However, the recent chapter may prove me wrong about that, since Isshin was able to enhance the Reiatsu/flame on the blade by blowing blood onto it, which is either a Kido spell or a very morbid ability for a melee-type Zanpakuto, but the thing I'm more concerned about is how he required that ability to increase the Reiatsu. For one, he himself stated he couldn't control his Reiatsu at that time, and on top of that, I'm not sure why he'd need a special ability or Kido to do something all Shinigami can do naturally, so his Zanpakuto being able to manipulate fire instead of Reiatsu is somewhat plausible. Anyhow, that's my two cents on all of this.