Seriously I really like how they concentrate on the side characters and especially on Sakura, unexpectedly, because it depicts some of her development. As a matter of fact this new arc, along with the Kakashi one, are so well organised that I'm beginning to think that Kishi might have a role in writing this plot in one way or another. Especially now that his main manga has ended and his schedule is flexible, I think it's highly likely that from here onwards he will play a bigger role at writing the plot of the fillers.