I understand this and yes it worked but let's keep in mind the structure of most, if not all NFL teams prior to free agency coz players had little or say where they played and limited or no leverage otherwise. Free agency has damn near killed this kind of authority. I'm not defending how Jerry has run/structured the Cowboys, I just don't see this as the best example of how the league is now structured.
How many fans can name more owners or GM's than Head Coaches?
NFL franchises are designed the same as they have always been designed. The Head Coach runs the team, the GM runs the football operations. Of course, it's important for the two to collaborate and the GM is the HC's immediate supervisor. However, most GM's do not interfere with the HC as it pertains to the team itself. The GM does assist in getting the personnel but the attributes of that personnel is usually a collaboration.
Typically, GM's only step in when it's time to make a coaching change and the owners only step in when it's time to make a GM change. GM's don't take a role in the gameplanning or the practice structure. there has to be communication between GM and HC when addressing cap issues or player issues..
The bottom line is that Head Coaches are the voice of the team when it comes to the media. They are the deciison makers when it comes to who starts, who sits. The gameplanning is their strategy.