User blog comment:Xilinoc/Ch. 580 - THE LIGHT/@comment-24284608-20140517134349/@comment-11051098-20140517180754

I seriously doubt they have Bankai. Kenpachi have just communicated with his Zanpakutô for a few days and achieved a real Shikai release, there's no way he already possesses a Bankai. And Yachiru, despite her speed and strength, can't possibly have a Bankai, she seem to be way too young and inexperienced.