Christopher, the partners in the advisory section don't have to be CA.  They're not auditors; they're from a variety of disciplines including law, economics, finance, health, media, environment ... depending on the advice offered or required. The current (brand new) CEO is a management consultant with a human resources background. 

Its a far cry from when an audit firm was just that. Now its a business, and from there stems the conflict. The advisory section is more lucrative than audit which is constricted in value by time. Therefore the advisory partners serving the same large corporate as the audit staff serve, might hope the pesky questions from audit staff can be swept away lest they upset the lucrative advisory business.

The only solution is to disallow audit and advice offerings from within the same firm. And still rotate auditors every X years which would answer the question "who audits the auditors."