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What you notice in Manchester United's playing pattern is not much different from what other observers notice, even Man United fans also notice this situation in their favorite team.
Rashford and Bruno have similar characters in the team.
A number of other central midfielders owned by Erik ten Hag also have the same style of play. I think the turning point that Ten Hag has to work on is managing or balancing all of that, not bringing in other players.
In my opinion, if you have to force yourself to buy another player, don't buy a player with the same playing style as the one you already have.
Managing players who have a high level of egoism is very difficult, especially if the coach does not have a brilliant career to gain a lot of respect. Ten Hag came to the Premier League with his team's good performance in the Eredivisie, but he has not completely failed in managing the team because in his first season he was able to bring Manchester United qualified to the Champions League.
Ten Hag must win the dressing room because everything starts from there. Some of Manchester United's senior players look selfish in the game and actually this should be resolved rather than bringing in lots of new players. I agree that there are certainly some players who come and go, but improving the performance of existing players must be the focus at this time.