1. I don't believe that LE is working on the same timeline information that is available to ordinary citizens on the internet (regarding AC man and various other questions.)
2. I don't believe LE would fail to investigate the landline and cell phone usage of RC, Misty, Tommy and his wife, Joe, and various other players, including other blood relatives of Haleigh.
3. I don't believe LE would fail to use cell phone pings to attempt to locate the location of the callers, as well as the time called.
4. I don't believe LE has revealed any of the significant forensic evidence that was gathered at the time of the abduction from the mobile home, the yard, vehicles, etc.
5. I don't believe LE has enough evidence, without the body, to make an arrest of the suspect or suspects they have identified--hence the pressure on Misty and Tommy to tell where the body was dumped or buried.
and, one extra: I don't believe this case will go cold, unsolved.