As waht i expected his jougan is the one contribute to defeating Momoshiki not just with his vanishing rasengan. Jougan makes him an Otsutsuki and his eye is said to be cursed since it will take everthing from him. I wonder why.
"Your blue eyes will take everything from you." - Maybe he means people will hunt Boruto just like Naruto was hunted due his powers. I hope not, the story would be almost the same.