User blog comment:Nick D Wolfwood/Questions questions questions!! Kurosakigate.../@comment-44061-20100624183806

No what you said was about how Ichigo told Byakuya that the getsuga tensho was the only technique he taught him and then you used what Isshin said. That would only point to the fact that all techniques are taught by the zanpakuto spirit. Therefore seeing that all zanpakuto are generally based around the same core principles that all shinigami learn their zanpakuto techniques from their particular spirit. So what Ichigo said to byakuya affirmed that. Also what isshin said can be taken in general instead of presumably giving it a familial connection like every one wants him to address. I wouldn't go so far as saying its family only technique theres no proof of that. Though as i previously stated because they are related they may have similar abilities while being different.

Also Aizen didn't say that about Isshin's getsuga tensho. He said that about Urahara's seal. Once again there would have to be a case that all zanpakuto in shikai have to look completely different then they do in bankai which is not a fact, so that concept cant be used to determine if a zanpakuto is released or not as plenty dont change form in shikai.