SAN FRANCISCO — For a nuanced portrait of the circular paths plowed through Northern California’s federal practice, regard the case against David Nosal.

It seems straightforward enough: Prosecutors indicted Nosal in April for stealing trade secrets from his former employer, the executive search firm Korn/Ferry International. During the multiyear investigation, Nosal hired Cooley Godward Kronish and one of its white-collar specialists, Joseph Russoniello, to try to talk Assistant U.S. Attorney Kyle Waldinger down.