No coach in the league wants to handle Hardy. He's a guy with a cocaine habit and erratic behavior.
As far as your Jimmy Johnson comment? Yeah you make a point BUT....by the time Jimmy left, the team was living the "Hollywood life". Gone was the young, hungry team looking to make their mark. The team became larger than life. They thought they were invincible...they were rock stars that just made a bot load of money.
Would Jimmy be able to handle a group of rich, entitled, superstar veterans as well as he handled a collection of guys fighting for relevancy fresh out of college? We will never know.