theory: Zangetsu is the antithesis of Kyōka Suigetsu

[Hand Banana]

I think we have forgotten something-Aizen and co were doing experiments on hollowficitaion right?I think Aizen and co have something under their sleeves. Also not to forget that Aizen called the Vizards low version of hollow.

You like um... never heard of an insult have you?

[Amargo Deathscythe]

You like um... never heard of an insult have you?

damn you beat me to it

[ddemon23]

This is another great theory amargo. What I envision is the name's wont mean anything as far as inside the manga (i.e. characters acknowledging the name contrast, etc) more it is just a foreshadowing tool for the readers. Also, I believe its gonna work in a manner in which Ichigo has a talk with zangetsu and he show's him how to use the all black getsuga tenshou to create a perfect darkness effect allowing him to fight without seeing aizen directly or something along those lines.

[Yondaime123]

Lol as i thought they aizen co can posses full hollow powers(espada lvl)

[Amargo Deathscythe]

eh i was kinda right