I'm thinking Kishi is still deciding the overall direction of this series. He may not get involved with the minor plots but overall he will decide where everyone ends up. I feel the whole point of the one shot was to define Mitsukis role in the new series. He will serve as the dark counter to Boruto.It's generally too early to say where Bolt will end up as far as protags go, we have barely got any real time with him.
Not to mention the story is going to be done by a completely different writer, everything is going to change.
The cold opening not showing Sarada or Mitsuki is a bit worrying though, as they might end up being side characters, only existing to further Bolts arc.
I feel like under kishi though the best they could've hoped for is being side characters. I mean look at how he handled Sakura. Or the other K13. I just hope they develop a decent relationship with Konohamuru. He seemed like such a prop in the movie.