Board Thread:Boruto Discussions/@comment-34436338-20180313180814/@comment-25122992-20180313215219

Also, it doesn't necessary mean that Urashiki would stick with other two as well. I know he was designed as a third member of their group, but he wasn't present when Momoshiki/Kinshiki harvested Unidentified World, so it's possible that he would act independently rather than collaboratively.