User blog comment:Xilinoc/Ch. 540 - The Sword Five/@comment-7630025-20130606091757/@comment-5775318-20130608054606

On that note, actually, Isshin also spoke about trying to learn the Final Getsuga from Engetsu, so its not like Quincy: Letzt Stil, in fact it might actually be more of the Shinigami Counterpart of Letzt Stil, seeing that both wipe clean any traces of quincy or shinigami powers.