User blog comment:Xilinoc/Ch. 541 - THE BLADE AND ME 2/@comment-5606268-20130612163809/@comment-6657474-20130613000103

That's assuming that the fake Zangetsu wasn't the very thing which was preventing the Vandenreich from stealing his bankai in the first place. An explanation as to how the devices work would be helpful, we'll probably get that when Urahara comes back into the picture.