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That's what some people don't know and they are just too quick to criticize DDG while he has been the saviour of united. Harry Maguire has been one of the reasons for Manchester United's poor defensive performance. There was no way a manager would spend about £80 millon on a player and kept him on the sideline because it would look bad on him. Despite Maguire's constant defensive blunders, OGS was still playing him and then came Ralf Rangnick who continued featuring him. His mistakes got to a point that even C. Ronaldo advised Rangnick to drop him. It was ETH that had the balls to relegate him to the bench. DDG is still a top quality goalkeeper, ETH just don't want him and he prefers Onana because he's very good at passing the ball around with his players.
Erik Ten Hag has always prioritized taking players who have defended Ajax, so he also really wants Onana to come to Manchester United. Regarding De Gea, in my opinion, the success of Manchester United is due to his contribution as a goalkeeper, but I also don't deny that De Gea performance at the end of the season had decreased, maybe because age affects playing productivity. But the reason is simply because this season is not comparable to Dea Gea contribution while at Manchester United and I believe he is still the best goalkeeper.
When De Gea asked for a raise, that was only natural, but the request was not at the right time because he was under Erik Ten Hag, who adhered to black and white principles. Thus the solution is for De Gea to leave rather than stay.