I was looking at all of Jerry's head coaching hires and found an interesting pattern. I may do a thread but for now .........
Other than Jimmy ..........each of his head coaches hired had to split or share one of coordinator positions with him. For example
**Parcell hired his own OC but Jerry talked him into retaining Zimm as his DC
**
Wade Phillips hired his own defensive coor ( himself ) but had to hire Jason Garret as his OC
**Jason chose his own defensive coordinator ( Rob Ryan initially) but was forced to hire Montel Kiffin and Rob Martinelli a year later. Jason was also forced to hire Bill Callahan as his OC.
** Mike McCarthy chose his own DC but was forced to keep Kellen Moore as this OC.
This point here is based on Jerry's coaching history/pattern it's very unlikely both Zimm AND MM will be fired. He seems to always keep a coordinator on either side of the ball for continuity. In other words, Jerry has never cleaned house with a new head coach, or new offensive and defensive coordinators from the outside.
Here's a history of Cowboys coaches over the years
https://pro-football-history.com/franchise/20/dallas-cowboys-coaches