User blog comment:Xilinoc/Ch. 577 - SWORD/@comment-11130627-20140416155018/@comment-5398287-20140417174533

Also the fact that Yachiru has her own Zanpakuto with a different name. If she were the spirit of Kenpachi's Zanpakuto, Nozarashi, she'd also use Nozarashi instead of Sanpou Kenju.