User blog comment:Xilinoc/Ch. 572 (inb4 "Kenpachi doesn't have Shikai")/@comment-24113610-20140312144930/@comment-24113610-20140312211142

I would buy that more if Kensei hadn't ordered Mashiro to hollowify when he was training Shuuhei. Shuuhei looked scared but he didn't seem surprised, suggesting that he had seen it in use before.

I could understand why they wouldn't want to use their masks now that they're back in Soul Society; but this is a war. You're supposed to use every dirty trick in the book if you wanna survive. If that means getting an extra power boost from the monster inside your head then use it! Duh!