As the criminal trial over the demise of Dewey & LeBoeuf enters its seventh week, it’s far too early to say who has the upper hand. Only a third of the expected 79 prosecution witnesses have testified, and a key cooperator has yet to take the stand.

But the contours of the New York County district attorney’s case are coming into sharper focus—as are the challenges that prosecutors must overcome if they hope to win over the jury.