Board Thread:Episode Discussions/@comment-25319479-20170531105724/@comment-2112031-20170605235408

UltimaDude wrote: The Wikia Editor wrote: To be fair, the entire situation with the dark chakra beast will probably be resolved within the current arc and there wouldn't really be much reason to bring it up afterwards.

As for Gaiden, most of the next generation characters within that story only appear for a single page if even that, Boruto himself barely appears in it.

We still don't really what became of Denki, Iwabe and Sumire later on, their absence in the manga might even be deliberate in order to keep their current status a bit more ambiguous, but that's just me speculating.

Iwabe, for example, might undergo some character development later on, deciding to deliberately not participate in the Chunin Exams because he doesn't want to rush things, instead deciding to train for the next Chunin Exams. No offense, but these all sound like excuses. Most of the new gen kids still appeared in Gaiden, so there's no reason why Sumire, Iwabe, and Denki didn't appear other than the fact that they're filler characters I'm not disputing that, I agree with you. It's pretty safe to say that none of these characters were even a concept when Gaiden or the movie were written.

However, the fact remains that the anime (at least the current arc) is being carefully supervised by Kodachi and Kishimoto for the sake of maintaining continuity and making sure that "nothing unnecessary" goes into it, which wouldn't be necessary if none of this is supposed to be canon.

When the anime gets around to adapting Gaiden, I'd imagine they would add some filler scenes to show where the characters were during those events.