They have Aubameyang and Traore. I think that's made Barcelona better at the end of the season. Although it was not the main factor, Aubameyang played 17 times and scored 11 goals. I think it's not bad, it proves that Aubameyang is still good. When Arteta didn't like him at Arsenal, he left. For Adama, indeed they didn't score but he played quite well. I think Xavi will need him if Lewandoski fails to join.
For now I think there is a possibility of Lewandowski joining Barcelona if De Jong is finally sold. Manchester United still seem so interested in the midfielder that they will try to convince Barcelona to let him go in order to reunite with his former boss at Manchester United.
I can confirm that Aubameyang and Adama are two important players who have ushered in the success of Xavi's first season with Barcelona. Adama contributed well with the speed and accuracy of his passing, while Aubameyang proved it by scoring important goals in big match. Both of these players are important for Barcelona, but Lewandowski will be something that makes the team even better.