It's not even an attitude. I look at it like the social groups we all had in High School:
Mike Nolan - the weird guy who always tried to dress classier to make him feel better about his own self. He doesn't do bad in school, but don't cheat on him during your mid-terms and finals...you know, when it really counts!
Mike Singletary - the dumb jock who was always overconfident about his abilities to ace tests without studying and achieved a 1.0 GPA. Best known for dropping his pants and mooning the crowd at a Pep Fest.
Jim Harbaugh - the competitive friend you would study with and see who would get the higher score on any quiz, test, assignment. One of the more popular ones in high school, but never liked the idea of fitting into a certain group. Eventually graduated and moved on to a better institution than yourself
It's literally night and day with the Harbaugh staff on the board vs. Singletary/Nolan. Much more detail oriented and strategic about their game planning.