Well according to Brad he was living his best life, happy as Larry a few minutes earlier, on the road (and then he heard gravel noises, he didn’t state he saw him off road or falling if you watch his interview).
If he saw the coast and kept going down, he would have been found. Whilst that path is dangerous- it’s not the walking that’s dangerous, it’s the falling rocks (hence why you need to wear a helmet). It would have been different if he went out rock climbing upwards and then fell into a ravine.
Lucy didn’t speedily manage to mobilise services either - the Guardia said she reported him missing between 6.00 and 8.00pm. The post asking for a lift up there was at 11.39 and when offered the lift, she delayed and said she needed to go to the police station first. They were also out there with other people, none of whom went with Lucy, so they didn’t get a sense of urgency either.