Which of these three "I’s" apply to Ken Lay? 

Were his actions illegal as the prosecution seeks to prove, just basic incompetent, or ignorant – did Fastow keep him in the dark about the improprieties going on in the company? 

The key may not rest on the technical items presented to the jury, but more likely on credibility — who do they believe. As usual Mary Flood (Houston Chronicle) here provides a wonderful review of Ken Lay’s testimony.  See also Carrie Johnson’s take in the (Washington Post) here.

(esp)