IMO, the only help Ring would have been in this situation would be to give us a pic/video of the suspect and possibly then aid in identification. Possibly, we could have been sure that he took Jayme alive, if the camera was still functioning during their departure.
True, except that given how he was dressed (balaclava/mask etc) - see criminal complaint - I’m not sure it would have helped.
I speculate that LE had something to believe that JC was still alive, they just didn’t say exactly what. IMO, possibly drag marks (again, I’m basing this on the criminal complaint).