User blog comment:Mrlmm0605/Let's Talk Bleach! Part 15b: Zangetsu/@comment-11446176-20160516093445

Zangetsu Part 1 ends up being his Quincy half, materialized in a 80's U2 version of Yhwach. Zangetsu Part 2 ends up being his Hollow half, materialized in a Bleached version of himself.

Then, Oetsu basically gave him an Asauchi (finally), which he then impressed the spirits into.

However, there should be still some Shinigami parts - you would think - especially with its similarities to Isshin's own Engetsu, down to the powers of the Shikai.

Question now is - is there a third part to the equation? The actual materialized spirit? Probably not, seeing as hollow half was always alluded to, and nothing else in his inner world has ever given thought to something other than Bono/Albino (Albono?) being his sword, and with the two swords he has now, nothing to point to one half of the power being stored in one sword. However, that's just the Shikai. Will there be a new Bankai?

Other swords have been shown to have a full, developed version - whats there to stop him from having a brand new bankai - one that is the "proper" bankai Kuchiki talked about way back in the first reveal - when he mentioned that it was way too small to be a Bankai. Maybe, that was just a hint, a foundation laid way back when, indicating that the Bankai itself was incomplete.

Who knows - until the real reveal.

Till then.... CONSPIRACY THEORIES!