The initial criminal target should be Loretta Lynch. The FBI reports to the AG. The secondary target should be Valarie Jarrett. The rest of the federal government reported to her.
I've read different accounts of whom the FBI director directly reports too at DOJ. I've read the director reports to either #2 or #3 at DOJ. Seesion's had FBI reporting to #2 which would have been RR.
Loretta Lynch never signed the Carter Page FISA request or the first renewal. Comey and DAG Yates signed off on both of those. Lynch claimed in congressional testimony she had no recollection of the Cart Page FISA requests. Either Lynch is lying or Yates decided to shield her after the tarmac incident.