Board Thread:Naruto Discussions/@comment-26567684-20150819061606/@comment-24593592-20150911210835

Artemika wrote: It was necessary.Gaiden was like a prologue to Boruto movie,it gave us information about Sarada and Chocho,their abilities and their personalities. It showed how Sarada awakened her sharingan,what happened to team Taka, Orochimaru and Kabuto. Since Boruto movie is supposed to focus on him and his advances as a Ninja there is little time to no time for other characters. Also,'Who's my real mother?' drama was for plot progression.

Sarada and Chocho are irrelevant in the movie. And according to Kishi Gaiden was made out of fan-demand for SasuSaku so he originally didn't have plans for it.