User blog comment:Xilinoc/Ch. 580 - THE LIGHT/@comment-24284608-20140517134349/@comment-24384892-20140517204717

I doubt Kenpachi has mastered a bankai yet. I don't think Kubo would rush to show us his bankai after we've only just learned his shikai like 3 chapters ago. We need to see more of his shikai first.