It's possible that he may just be burnt out.
http://dayoproductions.com/muto/
I didn't know he started out designing visuals for Comme de Garcons and Issey Miyake shows! His work was really good for the handful of Ayu PVs he did before 2009/2010 but maybe Ayu has him on time crunches when they end up editing lately? I know they were editing 'do it again' along with the other PVs for Love songs literally
a few weeks before release.