I don't know... I liked this episode, it at least explained what those three dancing things in the end credits were. As for plot, at least the filler is engaging instead of random 1 episode blurbs that have no point. As for it messing with the manga storyline... What's to say they can't duplicate at least some of the same scenarios when the anime gets back on track... i.e. Using Naruto as an example, if memory serves correctly, one of the characters is put into the hospital shortly before the anime moved onto a filler arc, and at the beginning of the manga arc they needed him back in the hospital, so they just hurt him again at the end of the filler arc and stuck him back in the hospital. Did it mess up the flow? Only in such a minute way that after that episode you forgot all about the deviation... I suspect that's what they'll do in this anime as well, just duplicate the conditions.