De Gea made serious mistakes and was responsible for the defeat of Manchester United in some games. I think he will remain the main goalkeeper but any new goalkeeper will replace him whenever he is out of form and might overtake him if he fails to prove himself.
Manchester United is already exploring for prospects to replace De gea because of his occasional costly errors, which amply demonstrate how quickly he is losing effectiveness. They need a world-class goalkeeper, more of a modern goalkeeper someone who is young and active to be able to compete and fight for the league. De gea is already 32 years old, and his bones are weakening. If United is searching for alternatives, I don't blame them. I believe it's the appropriate move. Andre Onana of Inter Milan, who only recently joined Inter as a free agent, is already being linked to Manchester United. The cameroonian was very impressive this season both in their domestic league and in the champions league. Inter will make profit from selling onana who joined as a free agent.
With Havertz, Rice and even Timber, Edu is smart. The team is looking for players that can play multiple roles. All their targets can play two or three roles and this is very good for a team like Arsenal and a coach like Arteta who can deploy up to 3 or 4 formations and playing styles in one match. I trust in whatever Arteta’s buys for the club. For Havertz, he is a good signing, never seemed fully settled at Chelsea always playing different positions and so many managers with different play styles.
We cannot determine whether a team's purchases are good or not until the players begin performing well for the team. We have witnessed many players who we believed were good signings for the club fail, including Havertz for Chelsea, Sancho, Hazard for Madrid, Ziyech, Werner, and so on. However, we have also witnessed some average signings who no one talked about become stars for some clubs. Therefore, it makes no difference who the coaches add, what counts is that they learn to adjust quickly and avoid becoming failures. Although Rice would make the team even stronger, all of the Arsenal signings up to this point have demonstrated talent. Let's just hope they are all adapt easily and perform to their peak.