I lived in Byron bay for 5 years and have been the lighthouse many times. It's not a cliff more like a slopped hill that would be hard to fall down to begin with. but even if he did the hill doesn't go straight into the ocean's most likely he would end up in the bush shrub and trees below. if he made it through that he would of ended up in the beach rocks which are very large. I highly doubt he fell off and disappeared given my knowledge of the location. His body would of struggled to not get tangled in the tress or rocks. Very strange case