Rashford will join the Barcelona squad on loan. Therefore, everything will depend on his performances. I believe Rashford will find success in Spain with his style of play, just like Antony. Antony had a great time at Betis. Rashford will surely do the same.
If he is given the opportunity to play more, I'm sure he will give his best for Barcelona, but the question is whether Hansi Flick will give Rashford a starting spot because, as far as I know, Barcelona's front line is already filled with Lamine Yamal, Rapinha, and Lewandowski. But I think Rashford is only used as a rotation option when Barcelona faces average clubs in the La Liga competition later. Well, when Rashford is given such an opportunity, it should be an opportunity for him to show his best so that management is interested in making him permanent.
If we look at the profile of the players Hansi Flick has coached in the past, he prefers fast, direct, attacking players who contribute defensively. From this point of view, Rashford is a player who could potentially fit into Flick's system. Barcelona's front line may be full at the moment, but there will be times when Rashford will get a chance.
As a rotation player, he can find many opportunities during the season. He can be utilized in two way roles. Because Rashford is a player who can be effective both in wide areas and around the penalty area. In the transition game, he will fit perfectly into Flick's system. He will provide very good efficiency especially for fast attacks.