McKinsey, BCG & Bain: Tell Me What I Already Know. The Many Faces Of Strategic Credibility & Celebrity. Often someone decides that new strategies need something more than the one your team developed, you know, the one that just won’t “sell” the way an outside one – with the right imprimatur – would, which is why I guess God made McKinsey, BCG, Bain, Deloitte, PWC and Accenture!