I just found out that Leverkusen has officially appointed Kasper Hjulmand. I am more familiar with Ten Hag by name, but perhaps that is because his track record is not very good. As for Kasper Hjulmand, I see that he also has a fairly good history, so perhaps he can lead Leverkusen better than Ten Hag. I have also heard that the selection of Ten Hag as coach has been acknowledged as a mistake, and management does not want to make any more mistakes.
I can't completely doubt Erik Ten Hag's competence because of a bad season in Old Trafford, as he has shown his worth over the years with not so small a club as Ajax going unbeaten in the group stage and knocking off Real Madrid and Juventus to get to the semi finals of the UEFA Champions league.
He did it and can still do it again, as we all saw the Ajax team play with so much understanding and communication. Nothing changed but the players, I believe all he needs are players that believe in the system and work on building a strong mentality.