User blog comment:Xilinoc/Ch. 579 - THE UNDEAD 6/@comment-6916556-20140507185035/@comment-24113610-20140508181209

@Chiligrinder you do know the skull and crossbones was part of her redesign 17 months after Aizen's defeat, again: before Kenpachi discovered the name of his zanpakuto. I think it's safe to say that nothing to do with Nozarashi

And as far as them being noticed by Kenpachi... I think being enveloped in a vacuum is pretty distracting, no?