Board Thread:General Discussion/@comment-26475399-20151228215405/@comment-26475399-20151230025057

Kaestal wrote: Well, when Uryu used the Letzt Stil and lost his power it seemed that he simply lost his ability to absorb Reishi from the environment as he could still see hollows and spiritual phenomenon whereas after Ichigo used the Final Getsuga Tensho he was entirely unaware of anything spiritual. In the first chapter after the timeskip he was entirely unaware of the spirits that were around Karin while Uryu could sense the various fights going on while he was powerless.

I've thought of this fact, too.

In reference to my earlier comment just above, my theory is to suggest that Isshin applied the basic idea of Letzt Stil to his own Shinigami powers, and that's how he created the idea of the Final Getsuga Tenshou technique. A crossover sorta move, where it was attainable, but the rules differed due to it being performed by a Zanpakuto.

With that brought into focus, i'm assuming that the FGT would naturally have a few different aspects to the aftereffect, from the aftereffect of a Letzt Stil.

The way i'm thinking, Quincies are, in fact, Humans with special powers and senses. They lose those powers, but they're still Quincies. So they retain the ability to see and sense the spiritual stuff that you mentioned.

Now another fact, Shinigami, however, are spirit beings. So their powers, being spiritual as well, are more linked in composition to the wielder of said powers. So i'm gonna hazard a guess that if a Shinigami uses an ability similar to Letzt Stil, the aftereffect would be more costly in the manner of spiritual awareness.

If i may also suggest, it could also be just how Ichigo was affected. His spiritual composition is a hybrid featuring Quincy and Shinigami both, so maybe there was just more to lose in his case. We don't have another example of a Shinigami using this technique, so maybe it's a difference between a pure Quincy (Uryu) and a mixed hybrid (Ichigo).

OR... since Ichigo was so powerful just before and upon using FGT, the technique that normally would have left him with the spiritual awareness still present, all that power being stored into the final attack of Mugetsu just drained more that it would have on a pure Shinigami.