Let's see if a club like Leverkusen can still be a competitor to Bayern Munich after Leverkusen is in the hands of Erik Ten Hag. No one knows for sure until everything is proven, and I will not praise Erik Ten Hag too much for a career that he has not been able to prove at Leverkusen. The Bundesliga is a different story and, but I am quite happy that he is back as a coach and gets a famous club.
Xabi Alonso + Leverkusen =

Ten Hag + Leverkusen =

I'm sure I'm not the only one doubting Ten Hag. We can realistically look at Ten Hag's time with Man United with some professional players and it ended badly. Meanwhile, Leverkusen don't have top players like Man United who can put pressure on Ten Hag. I find it strange why Leverkusen's management chose Ten Hag as Alonso's replacement. There are many coaches who are more modern than Ten Hag.
Erik ten Hag has had some good achievements in his career. Unfortunately, at Manchester United he was unable to win the Premier League. However, this is not a big problem because we have the case of the Bayern coach who, before becoming Bayern's coach, was the coach of a team in the second division of the Premier League and who, when he arrived in the first division, did not win anything. However, today the Bayern coach has won the Bundesliga.
So, Erik ten Hag with these achievements:
https://www.transfermarkt.com/erik-ten-hag/erfolge/trainer/3816has better qualifications compared to xabi alonso before arriving at leverkusen