The arc showcased that kagura is gonna be the next Mizukage. such a a title can't be given to a filler character. which means Kagura is canon becuase whoever is gonna be mizukage in the manga is Kagura not someone else. When ukyo wants to show all the next kages he will add kagura as a mizukage which makes him 100% canon You guys make me laugh. you actually think METAL LEE'S(CANON) teammates are filler? lol really? so you think metal lee's teammates in the manga are different people?? Nope they are iwabe and denki in manga and anime. so when they show us metal's team in the manga it's gonna be iwabe and denki. iN OTHER WORDS they're canon. give it time and they will appear.