How Important Are Managers to Team Success or Failure?

Nate silver: How important are managers to team success or failure? And how do we measure that statistically? In baseball, first of all, the strategic choices manager makes are not very consequential. The impact of that stuff is probably not more than a couple of winds a year,. over a hundred to game season. What i think is understudied is a how muh influence a manager has on getting the best out of his players.