The company where I work currently, an analytics company, was founded by a McKinsey alumn. The company is going on 9 years. Our biggest client last year was M

The company where I work currently, an analytics company, was founded by a McKinsey alumn. The company is going on 9 years. Our biggest client last year was McKinsey and when he first started the company (i.e. before biz dev), he leveraged the contacts he'd made at McKinsey heavily. All in all, I'd say the article argues one extreme, when as usual the truth is somewhere in the middle.