Sounds good. In the meantime:
Like I said before, we can postulate that somebody invented Genies in a bottle too, but where's the evidence? Just think about it. Suppose some brilliant scientist stumbled onto technological ideas hundreds of years in advance of the time. What evidence is there of the massive infrastructure and labor force required to create the materials and components necessary to manufacture and power huge mother ships and ultra high-performance disks? There isn't any. Is it reasonable to propose that it's all been kept secret for hundreds of years? No. Why? Because consider the Leonardo analogy again:
Even if Leonardo had stumbled onto the idea of cell phone technology, consider the R & D and infrastructure needed to make them into a physical reality and how long that would have taken to get all that in place back then. Microchips, radio transceivers, LCD displays, exotic materials like plastics that require oil and huge refineries, indium alloys for the screens, stable electrical systems, and on and on. UFOs are again who knows how much further along than cell phones? It's a totally ludicrous concept to think some secret society from the 1800s developed UFOs here on Earth. Not impossible, just ludicrous.
Perhaps, but then again, any sudden advancement in technology like that would get noticed right away by the military who would then commandeer it for their own use, in which case we'd be seeing them using something other than F-35s. It's been suggested that the F-35s are just a smoke screen to cover the real thing, but at over $100,000,000 a pop, that seems really unlikely, not to mention: What about everybody else? The entire Air Force of the world builds jet airplanes just to hide a few secret saucers? Again, it's too ridiculous to take seriously.
That's just it. When you try to "clearly think it out", it's so far removed from likelihood that UFOs from the late 1940s were built by some secret society that began in the 1800s that it's not worthy of serious consideration. That being said: Since then, secret military black projects like the SR-71 and other technology that has been within our grasp have been reported as UFOs, and I suspect that the secret to UFO propulsion is not that much further down the road. Maybe they've even got it cracked and under some R & D now. So who knows about reports that continue into the Postmodern Era of ufology. Will we even be able to be sure we can tell the difference? I'm less and less sure each day.