Rukia has not achieved the complete control of her shikai (if I spend more than 4 seconds blahblah), obviously the Bankai could be more dangerous. And she's not the first one to have some kind of collateral problem using her Bankai.
The flashback about the Quincy was totally useless, but the rest of the chapter was nice. The Bankai, the words of Byakuya and the two Liutenants. I hope we will see a tag team LOL, little Yachiru+Isane before having an help from Zaraki or someone else... Maybe the strenght (?) of Yachiru with the help of Hisane will stomp, before the Vollstanding...
Not an amazing or 'important' chapter but a good chapter, imho. 4/5