Board Thread:Versus Debates/@comment-34277398-20180728041812/@comment-26107879-20180730233054

"Boruto originated from Shueisha's proposal to Kishimoto on making a sequel to Naruto. However, Kishimoto rejected this offer and proposed his former assistant Mikio Ikemoto to draw it; the writer of the Boruto film, Ukyō Kodachi, created the plot. While both Kodachi and Ikemoto are in charge of the manga, Kodachi also oversees the anime's adaptation alongside Kishimoto."

For the same reason the Anime and Manga are canon. Kishimoto and Kodachi both supervise it just as Kishimoto supervises the Manga. Seeing as we always go by the logic of the latest always retcons the former, the anime has the most value out of the three.