We would all be very surprised - of that I am certain.

But why do you think that a mothership would equate to an invasion? And even then, why would we try to fight something that can sterilize the planet from afar and could have done so long ago?

On your other points: you could look into radiance technologies, their hires and funding. Maybe read the UAP part in the NDAA for this year, and tune into the congressional hearing next week with the AARO director mentioned in the article. I don't mean this is the evidence you are looking for, but it is still all very intriguing.

Having some experience with this topic, it is interesting to watch. I feel that things are even more complicated than anyone imagines. I think our ignorance is by design and has some good reasons.