Could you point me to any UFO wistleblower from govenment, military, science, etc. areas that revealed exact technical details about UFO. I mean really technical - not somehing like "it could hover silently!" or "It could turn at 90° at high speed!" or senseless drawings or descriptions of exterior or interior. Something like exact weight, power source output in Watts, maximum thrust in kN, something like "Power source connected to the engine with a cable/pipe/whatever with diameter/cross-section of ... <- exact value"? Anything like that?
First thing that engineer, scientist, military will do with unknown technology is to measure it. And it is not about dimentions, it is about all possible parameters. Also he definitely will try to find and write out distinct parts interconnections and think out a way to categorise different distinct parts, even if he have no clue what it is and how it works. And that are the things that any real whistleblower from aforementioned institutions will wistleblow. They just can't be unaware of that things if they really tried to use, work on, reverse engineer or study that UFOs.
What I find very suspisious, apart of complete absense of known technologies that appeared from nowhere without any traces of preceding technologies, is that there are no any technical details about UFOs governments presumably possess from any known to me wistleblower.
Valid point.
However, multidimentional objects and spiritual entities that could interfere with our physical 3D world should have measurable physical parameters. They could be incomplete, due to extradimentional/plane/whatever nature, but anything that interfere with our 3D world could be measured.
F.e. if you see it, then it have some color, brightness, reflectivity and so on, and all that could be measured. If you could touch it, it have some measurable hardness, roughness, elasticity and so on. Add to that volume, thrust, weight, EM radiation spectra from RF to gamma, etc.
So if wistleblower really work with such object, then, he had a lot of things to study.
Of course, if it is purely spiritual and appear only in mind of observer, then, of course, there will be problems with measurement.
AFAIK, most wistleblowers tell about UFO as about pretty physical objects. So there should be measurements and values.