User blog comment:Xilinoc/Ch. 560 - Rages at Ringside/@comment-7079377-20131204201204/@comment-26420452-20131205054426

Mask considering them captain-level is something. See, during his first raid, he quickly defeated Renji and Äs Nödt scolded him for doing so, because he missed the opportunity to get a Bankai. Mask was surprised because Renji wasn't a Captain, and Äs told him to go home and revise the Daten. Now, during the second raid, Mask seems to have learned very well who are the ones who got a Bankai (having Bankai being equalled to being captain level, even though to me those are very different things).