User blog comment:Xilinoc/Ch. 571 (Yachiru's gonna wreck it)/@comment-11446176-20140305130913/@comment-28861328-20140305180451

Though this is the Bleach Wiki, quoting their content isn't exactly proof of a point. The Bleach manga is, and, as has been stated, its debatable whether Kenpachi actually has a full-time release. The very definition of Shikai is knowing your sword's name and being able to use that name to unlock its power. Kenpachi can do neither.