Six Sigma Master Black Belt

I recently had an "oh $hit" moment.
A friend of mine with a prominent consulting firm asked me if I could recommend a Master Black Belt as a strategic management consultant. After all, I know at least a 100 MBBs. Guess what, I could think of a few and that's stretch.
Could you?
Unfortunately, many MBBs are clueless and neglectly incapable of assisting executives in clarifying their strategy. So how is it these MBBs are responsible for selecting strategicly important projects. They're not and they can't.
Why is that?