There are different translations of what Sasuke says because in the two movie plot descriptions I've read one says, "He is indeed impressive," while the other says only, "I already have." So it's a bit confusing on what was his main motive. Sarada mentioned that she needed to be chuunin first before becoming Hokage. If their team didn't win because of Boruto then yeah it would have held her back. Boruto getting training from Sasuke ideally could have prevented that.
That's true. Shikadai and Shikamaru did train...even though it was done with a lot of complaints. lol
