In looking at these photos and the discussion around imperfect data you must realize that there is no difference between using Adamski's photos to determine propulsion systems than what you are proposing. How can you begin to derive anything of merit from unknown and unconfirmed photos?
Take a look at these critters I saw float through my living room window and into the house. What can be made of them or their propulsion? Are they living or dead, technological, biological or art?
The great problem with much of Ufological history is the construction of theorems based on weak, forged or erroneous data. Imperfect data gets us only to one place - and it's very far away from anything close to what the UFO might be. If there is not stringent approaches to data then all we have is fantasy, wedding cake UFO photos, gulf breeze and third phase of moon shenanigans and nothing more. This is the foundation of UFO consumer culture and really has little to do with the phenomenon itself. This approach is essential to making the UFO'S what we want them to be as opposed to what they are. And that has dominated UFO 'studies' for far too long.
However, I still greatly understand the need to drive theories this way for truly the UFO leaves very little by way of consistent hard core evidence behind, so what the hell. May as well take the ACME approach to catching a Roadrunner when you have so little to work with in the first place.