User blog comment:Sosuke Aizen008/Can Yhwach use Yamamoto's bankai(Zanka no tachi) again?/@comment-5657895-20131001145442

Yeah, he STOLE the bankai. He did't copy it, he took it forcibly. Since Driscoll could still use Sasakibe's bankai it's safe to assume Yhwach can still use Zanka No Tachi.