I love the filler of the Sound 4 truly entertaining, I like the content, Rookies Spotlight. However there are problems at the same time. I don't like the fact that Naruto finished off the Sound 4, it was just too ridiculious to see Naruto use rasengen then off paneled.
I don't find a really big deal about the transportation sealing soul barrier or whatever it called, it's fillers what do
If they want to make the deliver blow properly, they should either remove some plot talk no jutsu from last episodes, or today episode when Naruto talking to shikaku to expand more fights for the rookies so that leaves more time for naruto fight against all sound 4 or they should make 1 more episodes.
I like the sound 4 flashback, it's reasonable to the main plot in my opinion.
Overall, all 3 episodes of the sound 4 will be 3.5/5