Board Thread:Boruto: Naruto the Movie/@comment-27453864-20151223012915/@comment-26567684-20151223021144

Remember, Sasuke started his investigation into Kaguya right after the war ended but he left the village when Sarada was still small (I'm going to assume between 5 and 7 because she was seen attending Naruto's inauguration and Sasuke left while Naruto was Hokage; Naruto became Hokage at 27 and Sarada and Boruto were born when their parents were about 20). He didn't return to the village until Naruto Gaiden, when Sarada was 11 and he explained he found a threat greater than Kaguya. However, after the threat (Momoshiki and Kinshiki) were killed in the movie, there was no reason for Sasuke to continue his investigation (I'm sure he briefly left to get some intel on the two) and the movie shows that he did return to the village and is bale to be with his family. The novel implies he left again but the novel is not officially canon with the series.

I'm not sure what ninja rank he has, but his powers are that of kage level. He's a ninja who works with the Hokage in the shadows, which is why Naruto refers to Sasuke as the other Seventh Hokage.