The manager picks the team. He has input to who he wants. After that he then has to get the team right tactically and put a team out that knows what it has to do. What formation,style of play etc.
If the board did not get the players he wanted, or the player didn't want to come, that's one issue.
But the fact we have no definable shape or style.of play. That our passing and defending is symbolic . And confidence is plummeting, THESE are issues the manager can address and change. And not by playing players out of position or who are struggling for form.
The buck for that stops with him.