As someone who consults on, among other things, surveillance (technical, etc) - I can tell you the "CCTV" footage is critical, but also likely very limited. It's unlikely that it was being real-time monitored and was likely static, intended to just track big movements, not faces, etc. But the real question is this:
1) MW's vehicle drives to the edge, but not necessarily MW unless for certain his text/call is him and the cellular carrier can be certain the handset sent it from Rosas Overlook and not Stunt Rd. (They can provide clarification on this for sure.)
2) People (how many?) walk past the surv camera(s), but did they go all the way to the end where they could see the car? Believe the camera(s) would be closer to the trail entrance and/or construction chokepoint (to record when equipment is stolen).
3) People (how many?) walked back out past the camera(s) again (did one additional person (MW) emerge on foot?)
4) What cellular carrier did MW have? Has someone tried using a handset on this network in the area and hiking down (towards Red Rock)? Does service drop below the overlook (but worked at the overlook)? (This is possible and therefore he could have hiked down, lost coverage, and then had issues with the terrain...but it's also not likely if the nearest tower was actually to the N/NW - he would be walking towards reception.)
5) The presumption should be that MW's car had a phone charger (most cars do and a tire over the edge won't drain the battery): so did his handset continue to 'ping' as active on the tower from 1148am onwards from Rosas (assuming that's where the texts came from)? How does this timeline correlate with the morning hikers passing the surv cams? After 1148am, did the handset signal the tower that it was being powered off? Or did it just never 'touch' a cell tower ever again (indicating the battery drained (odd), the signal was forever lost (odd), or the phone was smashed/battery removed)? These latter questions may be answered by re-reviewing the cellular data and CCTV footage. (As I previously mentioned elsewhere, the cellular carrier records a LatLong and, when a handset is powered down, an "IMSI detach" code.)
Clearly mixing in "new friends" (a term used at today's news conference), drugs (not mentioned), and a long-night of driving/partying adds a hundred other questions, too.
@joeconejo Good meeting you at the NEWS CONFERENCE.