This is as filler as a filler episode could be, honestly. Literally nothing happens, and they state in the show itself that the main plot of the episode was obsolete. It just simply wasn't great or interesting, even though we got probably around five lines of dialogue that are probably relevant to the story as a whole - but maybe not, as well. Either way, at least we're through all the filler and we can get back to canon material. That being said, it feels like we're going to go back to the training arc which is less than ideal for me personally, but at least it's not the goddamn Devil Believers.