I wasn't really surprised about Grimmjow's comeback at the end. Kubo had set it up for the next chapter, that being "666". Anyways, I'm not expecting Askin to be defeated so early into it. If anything, we need more clarification on Urahara's bankai and its abilities besides the big picture of it being able to reconstruct things. It would seem a bit convoluted if we were to get no further information than that. Secondly, Sklaverei could potentially be a counter for Askin's wound at the moment. This could be an opportunity for Kubo to showcase Grimmjow's growth in his capabilities as well as his "new" release.
With that being said, I understand how some felt underwhelmed by his bankai. When I first read this, my immediate thought was... "This is nothing like his shikai", and I sort of grumbled about it. In almost all instances, there's a similar theme from shikai to bankai. Maybe not exactly the same, but at least it's a theme. And then I started thinking about Urahara and who he is and how Kubo had portrayed him since the beginning of Bleach. For comparison, I thought of who Shunsui is. To me, this shikai and bankai combo is perfect for Urahara. It speaks to the layers of complexity about him. And much in the same, it does of Shunsui. If Zanpakuto's are reflections of someone's inner self and psyche, then the most complex characters should have the most complex range of Zanpakuto's. That was the only thing I could come up with for his unrelated shikai and bankai abilities.
Now, all we need is a panel on Nel's whereabouts.
5/5.