That's right, the departure of Xabi Alonso followed by Florian Wirtz and Frimpong has the potential to harm Leverkusen in the competition for trophies next season. They are key figures who led Leverkusen to win trophies, their departure is a sign of decline. It is unfair to judge Ten Hag too early because the Bundesliga has not started yet, but I would not expect much from Ten Hag. It is not easy to break Bayern Munich's dominance, they have a pretty good and luxurious squad.
Well, that's what I think so far. I don't know why Leverkusen management is too brave to take risks when their mainstay players leave the team but instead bring in a coach who just had a bad experience. I admit Ten Hag is not as bad as we think but competing with the bundesliga giants is not an easy task as a coach who has failed before. So I don't know what drove Leverkusen to bring in Ten Hag but I believe there is something we don't know behind the scenes. Hopefully there will be no bad drama like when he was still with Man United.