Inspector Rage's Promotion #91

Has Inspector Strong retired from the police department? Was senior Detective Smith passed over and Detective Rage is now Inspector Rage? Sergeant Jones has moved up and is now a homicide detective. Detective Williams from robbery is a new homicide detective. What is going on?
Does Detective Rage’s ambush with four dead and her jeep shot up have anything to do with all the staff movement? Why did detective Jones and Williams fly to Idaho on an FBI plane to interview a sheriff about a lawyer in the Hell’s Canyon case #90? Why is Homeland interested in old man Berry’s barn being painted in Idaho?
Is the Madam interested in the ambush, or the new police homicide department, or why Homeland and the FBI are investigating the ambush?