Actually Rashford as potential player but last season he not get enough minutes playing for Manchester United and can't showed his top level performance. If actually true with Erik tan Hag not priority with getting more attacking position player will give chance for Rashford getting back his position with Manchester United as regular player. I think Rashford can placed on right winger poaition or make him as central forward with Mancheater United always give this position for Cristiano Ronaldo.
Last season Rashford had 25 Premier League chances and I think that is enough to prove his quality. It's just that he was not in his best form last season where he only managed to score 4 goals and 2 assists. Those are not satisfactory statistics from a striker like him who plays for a top team in the Premier League.
Rashford is indeed a talented player who was at Manchester United, but unfortunately he did not manage to prove his talent perfectly as expected. He needs to work hard to become the best player in his position, and maybe he still has a chance to improve because of his young age. His main dominant position is the left winger, so maybe Ten Hag can try him on the right winger or center forward next season.