If he resigned, or didn't, from the Mutt Bros, it doesn't really matter. He's not the issue. There is no Audit Committee. End of story.
Your understanding of some the options available to R&H is perfectly correct. Except the AICPA doesn't control here, SOX does because it's a publicly traded company.
Under SOX, R&H reports to the audit committee. There's no audit committee. Based on "what did they know and when did they know it", what are R&H's options under AU 316??? I should really say, what are their outside counsel's options??? Knowing full well outside parties relied on previously issued "clean opinions". How does R&H cover their azz??
And this I can tell you with 100% certainty, (1) NONE of the audits are finished, and (2) THEY'RE NOT LEGAL EXPERTS. R&H relies on the SPNG attorneys for all legal matters in audited reports/filings. "Attorneys' Letters" cover this audit procedure.