User blog comment:Xilinoc/Ch. 668 - BIGGER,FASTER,STRONGER/@comment-957629-20160331154647/@comment-3423279-20160404231334

Well, who knows how long (if Yachiru is his Zanpakutou spirit) Yachiru was materialized? It could of been for years.

Yachiru, if she is Kenpachi's Bankai, might of been materialized shortly after he suppressed his own power and the whole "saving" her might of been him just finding her in that area after an unknown amount of time.

Quincy Zangetsu's Shikai and Bankai forms have different voices, it is possible that Kenpachi's could as well and he had no reason to connect the two.

Yachiru never saying a word when releasing Shikai is, for me, the biggest mystery about this. Yachiru has Bankai? Zanpakutou spirit herself? Most likely answers those two are, Yoda I am.

Isn't such a thing only possible when one has a Bankai? I guess we will just have to wait for Kubo to come in with an explanation or montage of sorts that causes it to all make sense.

Reserve judgement until next chapter is out guys c'mon, wait for the dang explanation before verbally going for Kubo's jugular vein with a rusty knife.