The behavior of the involved actors indicates pretty clearly that the investigation has surmised that the kidnapping and ransom claim is legitimate. Reasoning and objectivity suggest this. This isn't a ruse to catch the real perp. SG isn't in on a LE effort to trap her BIL or some other person. Ashleigh Banfield is neither a plant nor an authority. This is real life with real procedures to follow. Procedures that must be followed transparently or a perp will not get convicted.
Anything other than what we have seen with our own eyes the past week, or what has been happening before our own eyes for the past week, is hunch-based and perhaps even rationalizations to justify a presupposed bias or a misguided trust in an external actor's credibility and/or entirely anonymous sourcing.
JMO.