Its more like hes grown up a bit. Doesn't let himself be ruled entirely by his emotions, you could say the same for naruto now too... a lot more subtle than sasuke but its a start.
Suigetsu is a bad mofucka, his voice actor sounds exactly how I read it. Loved this episode, the more sui the better. The filler writing amazed me, for once I felt like I was watching some classy classic naruto.
I hope karin isn't half as annoying as sakura -_-