When a club is performing poorly, the first person to be blamed is the coach, because he is in control of the players. If a particular player is performing poorly, then he should be replaced, but if the coach doesn’t do that, then at the end he will be blamed. There are some players that we know are not really ready to play for the club, I don’t know why Ten Hag keeps on making use of them when you have better options on the bench.
A manager has a responsibility to give the best results for the team and that is how he manages the squad he has. When there is a bad situation like a bad performance or a bad day like injuries to many key players, the manager has a responsibility to deal with and resolve the situation. I am not saying it is the manager's fault. I am saying a manager needs to take responsibility for what happens to his team. The manager must know how to put each player in the best position. And most importantly the manager must have tactics that suit the style of play of his team.
More or less like that but unfortunately we don't see that in Erik ten hag. Just imagine he always puts some of his golden boys on the field even though their performance is declining, let's take Rashford for example or even Mount who was also played some time ago. Even though it is clear that it will not change anything but it seems Erik ten hag is still insistent that his players can do something miraculous.
On the other hand, I didn't expect Wan Bissaka to be sold and chose Dalot for that position even though it is clear that Wan Bissaka is better than Dalot. I feel sorry for Maguire considering he has come back from a slump but his teammate is still playing badly as usual. Here the coach's decision determines everything and if he places a player in the wrong position then it will reflect the results obtained. One more thing, if Casemiro feels like he is no longer suitable for his playing style, Erik ten hag must play Manuel Ugarte.