I don't understand why Manchester United would prioritize signing a relatively young talent instead of focusing on bringing experienced players who can add significant depth and quality to the team. Given the club's current struggles, their priorities should be on acquiring established players who can make an immediate impact and help restore their competitive edge.
Usually, when a club signed a young talent that hasn't gotten a big exposure, the contract comes with a long duration which bind the player and the team until the end of the end before they signed a new one, so the team has nothing to worry about their behavior. The team can't bring in all team that are already exposed, it has to be mixed with experience, new blood and young experience ones, that's how you bring fairness and equal quota contributions from everyone.
Rashford has made some mistakes and his beef ETH didn't end well plus in the end, his contributions was poor and we can't always know what happened behind the scene. I just know that there is no club that will spend huge amount of money any player and will plan on benching them or loaning out immediately, they will make sure it brings something to the table before any other decisions is taken and unless the ayer is not interested in the club.