User blog comment:Eduardovongola/Renji Overpower/@comment-24107489-20140101135545/@comment-5398287-20140103180837

Indeed. With their masks on, they kick ass in so, so many ways (Kagamibiraki, anybody?), but without donning them, they're basically regular captains and lieutenants. The only Visored who really stands out as being more powerful than his position is Hachi: he was the lieutenant of the Kido Corps, yet he used a more powerful - possibly even unique - version of Kin, and he's made his own Bakudo spells in the past 100 years that seem like they'd be legitimately effective against anyone other Baraggan "Cheatyface" Louisenbairn.

Speaking of the mask donning, I get the feeling Kensei and Rose didn't use their masks because they didn't want to waste the few minutes they can wear it on Mask, who, despite being pretty damn strong, was considered to be a mook.