We'll see how Rashford performs at Barcelona, whether he can improve his form or whether he ends up just sitting on the bench. Barcelona has a number of quality players, and if Rashford doesn't work hard to reach his best, it's not impossible that he'll end up on the bench. Barcelona brought in Rashford on loan solely to add depth to the squad, and if his presence doesn't make an impact, Rashford won't be an important part of Barcelona so this needs to be considered by Rashford as a step to restore its curry..
Rashford can't afford to be lazy if he wants to become a key player in the Barcelona squad, and he must also be able to work with the existing players in the squad. If he continues to show his ego during any match, he may not get more minutes in the Barcelona team and won't be signed permanently by Barcelona after his loan period ends. I also want to see how Rashford adapts to the other players at Barcelona, as they were generally good players, judging by their performances last season.