User blog comment:Tekkphreke/Theory on Ukitake's Bankai/@comment-3143776-20130912154203/@comment-6657474-20130912215455

ZMaine, just because Kubo didn't say Ukitake's bankai would be revealed doesn't mean it's not going to happen. After all when Ukitake learned that the enemy had the ability to steal bankai, he seemed genuinely dismayed, as if he was considering the possibility of using it, and Shunsui comented that the Wandenreich Quincies weren't the kind of enemies the captians could defeat without using bankai. Furthermore, we know that shikai releases far less power than a bankai, and since we now know that the Soul Society's immense concentration of reitsu gives the Quincies an almost unlimited source of power to draw from, their attacks may be too powerful for Ukitake's shikai to absorb and fire back.