I'm guessing Piper set it up this way on purpose, so there's a firewall between the company and the forensic auditor. The BOD must have approved this set up too. Is this what Kung didn't like? To go about this right, Piper more than likely pushed his resignation because he wasn't really independent. The new arrangement with Piper took away his authority and makes his resignation claims literally correct.
except that Mr. Kung's resignation letter indicated that he did not believe he could execute his fiduciary duties and roles as independent director and Chairman of the Committee to choose capable and appropriate independent professional advisors to the Audit Committee. An independent investigation is being conducted by the Audit Committee into certain matters identified by the Company's former auditors at the time of their resignation