Expected the situation with creating a Zanpakutou to have been that, and Mimaiya's comment about deciding king of the hill is a nice throwback to Ichigo's previous Zanpakutou training. Thought Muu would involve Aizen, but was pleasantly surprised it was Kenpachi's training. Unohana's kenpachi side was seriously scary, and it was interesting to learn that the two had fought before and given each other a wound. Unohana supposedly knowing all the sword styles was amazing, and Shunshui sending them to fight knowing one would likely die was a surprise. Very good chapter.