User blog comment:Xilinoc/Ch. 564 (Mask is too fabulous to live)/@comment-117598-20140115180531

Can't say I buy this explanation. Sorry. The reason for the change is because Zabimaru only partly acknowledges Renji, hence an incomplete Bankai. So Ichibei tells Renji its true name so it can access its true form... Isn't that still up to Zabimaru to decide? I mean, just because Ichibei tells Renji its name, doesn't mean it changes Zabimaru's mind. If at that point it still hadn't told Renji its name, then shouldn't that mean it still only partly acknowledges, regardless of Renji's new training. If anything, Zabimaru would be more weary of granting Renji its true form if he's once again bypassing the proper training and forcing it grant him its power.