1) A nice succinct explanation of how the grand jury process works, and why it takes time;
2) A prosecutive theory that allows for the Big Picture conspiracy narrative that I've been hoping for--a theory that gets you past the nickel/dime false statement stuff. It's a conspiracy to defraud the federal government of the faithful services of the agencies involved--the FBI, CIA, maybe DoJ.
Wikipedia has a good discussion of Honest Services Fraud, under 18 USC 1346. Here is the statute:
"For the purposes of this chapter, the term scheme or artifice to defraud includes a scheme or artifice to deprive another of the intangible right of honest services."
And here are some notable excerpts from Wikipedia that should give an idea of how useful this could be for Durham:
The statute has been applied by federal prosecutors in cases of public corruption
Since at least 1941, particularly in the 1970s and 1980s, and prior to 1987, the courts had interpreted the mail fraud and wire fraud statutes as criminalizing not only schemes to defraud victims of money and property, but also schemes to defraud victims of intangible rights such as the "honest services" of a public official.
Honest services fraud is generally more easily proven in the public sphere than in the private, because honest services fraud by public officials can include most unethical conduct,
The statute grants jurisdiction to the federal government to prosecute local, state and federal officials. It is frequently used to fight public corruption because it is easier to prove than bribery or extortion.