It would be near impossible to argue Bevell's greatness (in the bigger picture). He's had a patch work line, suspect even when healthy, a SHORT, almost rookie QB and for the most part, a set of WRs that most never heard of before and an awesome TE that he has to use as a blocker. Yet he stands at 10-1. Imagine the sleepless nights it took to make that happen.
Coordinators, both O and D, almost have to have an arrogant gene to be successful. Sometimes that leads to TOO MUCH thinking outside the box. Bevell (etc.) want to be recognized for their genius and there's nothing genius about handing the ball off to ML. He knows if he gets "creative", and success is the result, that gets him such recognition. It's this very mentality that has exposed Sark as the frikin 'tard that he is. In all honesty, I probably like Bevell 95% of the time. Unfortunately, it's that other 5% that gets threads named after him. Human nature.