Board Thread:Boruto: Naruto the Movie/@comment-24992241-20160112202210/@comment-756329-20160114135228

From what we've learned about chakra, it's random but there is a certain inheritance value to it.

Uchihas NORMALLY are fire natured, there's a reason they are associated with fire so much. Same goes for the Sarutobi who appear to have a lot of fire based hiden abilities.

Look at Boruto and Naruto, Naruto is wind natured and Boruto can states he's learned, Wind, Lightning, and Water before the movie started while Minato AND Kushina had Wind. That implies chakra is heredity in some fashion for the Uzumakis in Wind or Minato's line in general.

So the odds of Sarada being Fire natured and having a aptitude for Lightning based on this inheritance theory. Game seems to realize she's Fire-Lightning, and odds are "Boruto" show will go along with this