Toei said in that manga convention in Spain that they wanted to make an arc with Piccolo and Gohan as the leads.
Those idiots must have loved the garbage concept for this arc.
None of the other characters are interesting and/or powerful enough to matter.
Not the U6 saiyans, not Gohan, not anyone in the pride troopers that isn't Jiren.
And Jiren should fuck off too since he brings nothing to the table, just a boring wall for Goku to climb in the anime, and a boring moralfag in the manga.