The hair thing must have been a concept, because in many promo pics we se a looot of hair floating around. It was pretty stupid and difficult to animate, and mostly gone totally wrong. In act1 it was nicely done, but already over the the top. In act 19 Usahi looks fine, but the hair makes it all just an ugly mess...this has nothing to do with tight deadlines, but with bad decisions and untalented animators.