Barcelona's appearance looks very different from some of the previous Barcelona matches. Barcelona when facing Atletico played very attacking,
and continued to put pressure on Atletico's defense. Maybe this is because Barcelona have started to strengthen by some new players, especially
Adama Traore playing very well.
I seem to agree with you. Adama made quite an impact on barcelona's attack in that game and this is something to expect from his loan transfer from Wolves. Apart from Adama I'm also sure all Barcelona players also performed very satisfactorily in that match, this is really as expected.
Although Aubameyang hasn't shown a good performance when playing, I believe he needs more time to adapt in Barcelona's front line. He has to try his best from his performances even though this is just the beginning for him at Barcelona. Xavi needs more experienced players in his squad to stay calm when under pressure from opposing teams during match.
This is what makes Barcelona more confident when facing Atletico, especially if Ansu Fati and Memphis Depay are
able to return to play. Barcelona squad is getting stronger. With Barcelona's big win over Atletico, this made the morale of Barcelona's players
increase. This is of course a good effect for Barcelona, hopefully Barcelona can be even more motivated to beat Espanyol in the next match.
Because Barcelona need to win a lot to ensure they are in the top 4 until the end of this season.
If Barcelona can play like this against Espanyol then I'm sure they can win the match too. However Espanyol were not at their best after their last loss to Bilbao, but derbies are always different.