Ten Hag is as much the opposite of Alonso as he could be, there are literally zero similarities between the two coaches. I think it is a mistake, but who knows maybe it is owed to the fact that not too many coaches are available at all.
Erik ten Hag is a pretty good manager. Take a good look at his Ajax days, he had no such issues with communication and whatever they say about ego. Interviews with his players also confirmed that. He did well during he first season with Manchester United, one thing people should know is that he has the best winning rates after Sir Alex Ferguson. That said, I'm one hundred percent certain he will be successful with Bayern Leverkusen.
Erik ten Hag is notca bad manager if you check his achievements during his days at Ajax but coming to Manchester United you can't compare what he's done in Ajaz to Manchester United because after his first season with United the his rest days was a disaster because he couldn't get the United team to a better position other than issues upon issues. Bayer Leverkusen is a team that has good players I believe he's going to succeed there if he could manage the players well and not get into any problems relating to his choice of players in the team.
ETH actually brought Manchester United to perform quite well, especially in his second season which managed to bring home the EFL Cup trophy and also brought Manchester United to finish in 3rd place in the final standings of the English Premier League. However, after that, Man United's performance plummeted even though in the 2024 season they managed to present the FA Cup trophy. A fairly good achievement, but the investment made by the club in the ETH coaching era was quite large, so the results obtained were still not as expected.
And now ETH is with Leverkusen, he is in a team with more pressure, because in the previous season Bayer Leverkusen performed brilliantly with Xabi Alonso. Many doubt that ETH can maintain and improve the performance of the Leverkusen squad, especially since Bayer Leverkusen has now sold its key players. So I think your assumption that ETH is now in a team with good players is a wrong assumption, because what happened was that ETH had to rebuild the team from scratch.