The only aspect where I felt he lacked was his choices of players he signed and the ones he sold because they were also part of the reason he failed at Manchester United and stained his reputation, maybe Leverkesun could be his chance at redemption.
Well, this is what I was worried about when Ten Hag became Leverkusen coach, he brought in players or sold players inappropriately. Meanwhile, Leverkusen do not have large enough finances to recruit the players Ten Hag wants. This concern does not mean judging Ten Hag badly, but rather like the fear of it repeating itself at Leverkusen. While Leverkusen is currently getting its bright period after a long time struggling to compete with the top teams. But we'll see, hopefully Ten Hag will be more careful.