Quote:
“His early cooperation was particularly valuable,” Mueller writes, “because he was one of the few people with long-term and firsthand insight regarding events and issues under investigation by the SCO” (special counsel’s office).

Mueller adds that Flynn’s decision to cooperate “likely affected the decisions of related firsthand witnesses to be forthcoming with the SCO and cooperate”— and redacts the sentence that follows.
4 takeaways from Flynn sentencing memo (Vox)