I am beginning to feel that we are back in the 1950s and 60s! Let's face it, by selecting a bunch of cases that can (a) be easily explained, or (b) are totally inexplicable, you can put forward an argument for your particular theory, but proof by selected instances is a game. The only way to get anywhere is, in my view, (a) put aside any particular theory and aim to find out the facts; (b) cases that can be easily explained -- I'd say 80% but make it 95% if you want -- can be ignored; focus on the genuine unknowns. (c) Forget your conviction that you already know what they are, whether it's alien craft or "all cases could be explained if we had enough evidence", and subject these cases to statistical analysis. Many of the most interesting findings of Vallee in the 60s have never been studied or extended. Somewhere in the data there are clues waiting to be discovered.
Here's an example of strange balls of light that suggests all kinds of ideas: Nick Redfern, in his book The Pyramids and the Pentagon, includes a chapter entitled Stonehenge and Secret Files, which describes official investigations of odd events around the stone circles at Avebury and Stonehenge in the late 1950s and early 1960s. In Salisbury Plain, much of it under military control, at least seven sightings of balls of light took place in 1958-9. Balls of light were seen hovering overhead and in several instances followed to Stonehenge, where they entered the circle, hovered awhile then flew into the sky. On two occasions some of the trainee soldiers approached the balls too closely only to experience frightening hallucinations -- a dragon, an angel, and a vision of the Virgin Mary. The distant observers saw them standing entranced. In 1962, a lady from Avebury also encountered one of the balls. It approached her and apparently dropped liquid metal globs onto the ground. Then it silently exploded in a brilliant flash and when the witness recovered her vision it had gone and in its place was a huge monstrous worm that opened its eyes and began to wriggle towards her -- exit witness. Could this be an entirely natural phenomenon that happens to cause hallucinations? Or some kind of device that is designed to do exactly that to cover its real identity -- whatever that is? It suggests that maybe it has a repertoire of possible hallucinations, and interestingly all of the visions quoted by Redfern have been reported in other places, as Forteans well know. Maybe get too close and you will hallucinate a flying saucer?