Bayern Leverkusen is still a very strong team regardless if they changed the manager or not or even if they lose some players to other clubs. When you’ve built yourself to be feared by other teams, they will still fear you even though the players that built that courage in the team are no more playing for the team. I have trust in Eric Ten Hag and we should give him some benefits of doubt and see how he excel through the season with the team before criticizing him and coming to a conclusion.
I actually think them losing Xabi Alonso as coach and some players is going to cost them Silverware in the coming season. Bayer Leverkusen will be like the Old Borussia Dortmund that would most of the time play second fiddle to Bayern Munich.
Building a team that coordinates so well like Bayer Leverkusen did last season takes a lot of time.