User blog comment:Xilinoc/Ch. 592 - Marching Out the ZOMBIES 3/@comment-24113610-20140808065406/@comment-11051098-20140808211027

As I understand it, the dark skin indicates that they really are dead. Hitsugaya was zombiefied while alive, but was killed shortly after. So alike Bambietta, he's dead, the only difference is that she had to die first, while he could be zombiefied first and then die.