I think Mullen has been fine. His ego is too big to leave the SEC West. What a major admittance of defeat it would be if he packed up and left for a easier conference. He is building things the right way here, and with the way things are going, you know 7-9 wins per year, he can stay here for 20 years. Good food takes time.
Now why does Mullen look calmer on the sidelines right now? Gary Danielson made a good point about Saban yesterday in the Bama game. He said that when Bama is playing well and winning, Saban is much more animated on the sideline. He gets in more people faces and demands a higher level of play. However, when Bama isn't playing well, Saban is much more calm and supportive of his players in an effort to build their confidence.
Coaching, at times, is all about reverse psychology. Its about giving your players what they need to be successful, not about giving into your own emotional reactions. Good coaches are able to control emotions in order to accomplish this. Good coaches are able to put themselves in their players shoes and ask the question: What would help me play better if I was in my players shoes? When you play in Tiger Stadium and Bryant-Denny, confidence can be hard to come by. Therefore, it is Mullen's job to give his players as much confidence as possible. Shaking them down on the sideline rarely works in doing that.