Revolving door execs -- especially CFOs -- are a time honored pennyland technique. Hard to blame the CFO for some shortcoming if a company has a new CFO every few months and many are called "Interim."
I always check out the main financial officer first, his education, his firm and whether he's a CPA or just some bookkeeper, or not even that. Actually I tend to read SEC filings backwards starting with the financial certifications at the document's end. I'll usually pass on any stock without a "Big Four" signing off. I recommend that others do too.
There's a damn good reason Big Fours audit about 99+% of NYSE firms. The costs are insignificant compared with the benefits.