That Boyd DoJ Congressional interfacer is a long term Sessions minion rather than a long term DoJ insider, but over at the FBI, Sessions likely has no imbeds.
Sessions still needs to be held accountable for the opacity at the DoJ/FBI.
Yes, directly for the DOJ. That's his. But the FBI has it's own head, and that person reports to Rosenstein.
Could well be that Wray and Rosenstein are sandbagging Sessions. That's a pretty common institutional dynamic to have a staff that is in silent rebellion.