User blog comment:Xilinoc/Ch. 561 - THE VILLAN/@comment-11477779-20131211094259/@comment-26420452-20131211105340

Even you are going a bit too back. It hasn't much to do with Kensei. Mask called Rose as a villain two or three times for having been merciless to James. When Renji came, he referred to himself as a villain in order 1 - to show he's an ally of Rose 2 - to show he's also going to be ruthless.