There will be a huge discussion this offseason about whom the Braves should hire to replace Cox, and the simple truth is that it doesn't really matter that much. If the Braves have the players, they'll win; if they don't, they won't.
At one time I thought that the biggest tangible benefit to Cox's masterful clubhouse management was that the Braves got to keep almost every one of their own free agents that they wanted, but now that the modern Braves are out of the top-shelf free agent business entirely, that really doesn't matter anymore.