If the Army would clarify ARs rank it would help.
Why did Robinson meet with the family?
Because he was the person she was on the way to seeing when she disappeared?
Or because he was her supervisor.
MOO think he may have had a set of temp stripes, if not and he was doing E5 duties without authority, that is a command problem.
The Army for obvious reasons does not want this to be sergeant on private crime, so they are working to get them percieved as peer E4s.
The 2 star self-servingly at the PC called VG a "Specialist" in his rambling press conference.
MOO that's step one of the same old game plan, minimize, delay, distract and deny.
MOO based on the skillful story AR gave CA, that he killed VG "for their love," and how hard it was to solve due to ARs assertive actions, to me it appears that AR was very smart and able to work people's perceptions, AKA a skillful and confident liar.
MOO since AR ended up a murderer, it would not be a stretch to say he almost certainly very creepy before hand, but given his people skills was able to hide it from everyone except his target.