Remember Feynman and how science works. We are looking for the most reasonable explanation that is consistent with all observation/evidence. Not a proof. We don't need a robot taking pictures 20 feet from the cornice for this to be the most reasonable explanation. Any assumptions you make are not evidence against my theory.
My theory predicted white things at the crests of hills at RSL sites, I went looking for white things and found them. Kind of supports my theory. My theory needs snow fall during RSL season and it is the same season there is snow fall. Another support. I need the wind going from behind the RSL cliff toward the cliff. If I find this, would it change anyone's opinion?