Should have been:
Sarada; Fire/Lightning
Boruto; Wind/Water
Mitsuki; Lightning/Earth
Honestly, Boruto just has no business or purpose to have lightning, and it just makes it look like the writers sucking his dick to make him popular. He doesn't need 3 elements as a 12 year old. He doesn't need 75% of all screen time for his very slight and meaningless development from cheater to non cheater, and his mild daddy issues. For a "Prodigy" he sure does suck, considering he is bested by taijutsu and shurikenjutsu and Genjutsu by sarada, bested in most fields by Mitsuki, and even his classmates are better than him in other small ways. (Not stronger overall, just have better areas of expertise.)
My point is, how is he a prodigy? I swear its only because he has 3 ELEMENTS. he has done nothing else special AT ALL. and he sucks with water and lightning, compared to what other characters can do with their own elements.
Honestly, his classmates other than team 7 largely suck. The new generation is slightly weaker. They don't have any power houses like part one had Gaara and Sasuke (Even Sarada is slightly weaker than sasuke, only due to her... poor use of sharingan. Though she's never had someone to train her and she just got it.) Boruto being called a prodigy in this generation is hardly saying anything.
Shinki is a prodigy. Sarada is an Uchiha with potential. Mitsuki has a massive trump card and true ninja instincts.
Boruto? has three elements that are weaker than his Kote device.
Even Shikadai was going to beat him. Sure it was with a surprise move that would not work again, but for a brief amount of time, Shikadai outclassed Boruto. That is not prodigious.
-End of rant for why Boruto doesn't deserve lightning style and only got it because Sasuke is his teacher and he needed it-