I don't disagree with you. A manager is, in essence, a delegator. Like the captain of a ship, he needs to know how to delegate and trust his coaching staff. That said, he still needs to define "true north" for the team -- how are they going to try to meet the goal (whatever that is).
It would be interesting to see how CC would have done this year with this team. My feeling is that he would not be doing as well as Murphy because I don't think CC would adapt his managerial style to match his personnel. Again, only speculation.
When listening to a recent Cubs sports radio broadcast via YouTube (can't find it), the blame was solely on the GM.