Yeah, Sasuke could train them both. It just sucks that he pays more attention to Bolt than Sarada. He's being just like Fugaku, who praised Itachi more. And plus, Bolt x Sarada is just another fanservice pairing. It's fu*king ridiculous! It doesn't matter what clan they're from or what team their parents came from. If you're going to make a pairing, make them love for the sake of love and not a friggin legacy.
That is why NaruHina and SasuSaku both seemed so forced, because they're entirely one sided and has no care for the prospective of the male characters. They were just forced on all of a sudden to satisfy the fanbase.
*Btw, I have no idea how SasuSaku has SO many fans and still ship them to this very day...coughs.*
That is what Kishimoto, Hiro Mashima, Tite Kubo (Even though Rukia x Renji was completely random as hell) doesn't understand.