It can't be a benchmark indeed, but at least we can measure the strength of a team like Leverkusen at this time, whose embarrassing defeat in the pre-season match made many people doubt the Leverkusen team under Ten Hag's coaching and assume that they will not be better in the future, I think it is natural to use this as a benchmark or speculation about what will happen in the future.
If the match had been competitive. And if Leverkusen had lost by a small verge, there would not have been so much reproval about this match. But Leverkusen lost 5 -1. And leverkusen lost to a team that we did not know even a few days ago. Leverkusen conceded 5 goals against flamengo u- 20. So it is natural that the fans will now question about Leverkusen's ability.
Leverkusen has appointed Ten Hag as their new manager. Ten Hag is a coach with a bad past record. Ten Hag has completely failed with Manchester United. It is completely uncertain whether he will succeed with Leverkusen.
In a few days, Leverkusen will play against Bochum. I am looking forward to this match. Bochum is also a weak team. They did not qualify for the Bundesliga. If Leverkusen performs badly in this match too, I would say we will have to wait and see Ten Hag fail with one more club.