Erik Ten hang was worse for me, we all thought he knew what he was doing when he was keeping Cristiano Ronaldo at the bench, not knowing the young man didn't just like Ronaldo and probably he was intimidated by Ronald's status and as a coach he couldn't manager a star, Ten hang was one of the reasons Cristiano Ronaldo had to leave for Saudi.
I agree with you, he was one of the triggers for MU going under, who in their right mind would leave CR7 on the bench? Only him, and if it's because he didn't like him, then in light of this, it seems bad to him. However, as I've said, he can improve, but if Bayer sees that everything is going down the drain, they have to get rid of him, and fast.
Sometimes we tend to know more than coaches doing jobs they've become professionals. Erik ten Hag has nothing to do with Manchester United going under, it was due to their terrible performance that they were not able to do better. When Erik ten Hag left, and the slot was open, Ruud van Nistelrooy coached for about 3 seasons, and they never lost a game in that window, Amorim came in and couldn't do the job properly, Manchester United is big club and needs a big mind with a good team, so far this is what they are missing