User blog comment:Godisme/BEFORE THE SHADOWS/@comment-893506-20120822171757

I enjoyed this chapter. It actually shows some of Yamamoto's and Sasakibe's relationship, as well as Sasakibe's Bankai. We learn that it was strong enough to give Yamamoto the other half of his trademark scar, and that Sasakibe needed to train more in order to master it completely.

I may be presuming too much because of the entire interaction between Driscoll and Yamamoto, but it seems to me that even if the Stern Ritter can capture and use a Bankai, it doesn't necessarily mean they can use it to the fullest extent as the original wielder could.