Signing a new goalkeeper doesn't guarantee a stronger defense for Manchester United, but it's far better than retaining a goalkeeper who's simply not a good fit for United. I support your opinion that it requires solid teamwork, but unfortunately, Manchester United's squad doesn't want to make major changes and is still retaining some of its old players. Meanwhile, the squad needs a major overhaul to improve its performance and maintain a more stable squad. We can see an example from Chelsea, who have undergone major overhauls over the past few seasons.