My experience is that the grays are doing all of it.
Discernment is key. An advanced spiritual being does not need a spaceship. Their soul alone is their spaceship.
There are many souls from many realms here. The way I tell them apart is by the color of the Light at the seat of their soul. All humans have a white light as they were created by God. This is what allows the human soul to grow and experience LOVE.
The demons have no light as they lack the connection with God. They never had a physical body.
It’s interesting. When I am around a demon, I get cold as it is draining my soul energy. When I pray, the energy flowing into me is more than they can stand and they flee.
Jesus differentiated between demons and unclean spirits. A demon never had a physical body of its own. An unclean spirit did, but went astray. The unclean spirit still has the Light of God at the seat of their soul, but it is hidden in the layers of sin. They are redeemable and can change. The parable of the vineyard workers is very accurate.
What do you make of the descriptions of a praying mantis type being often in the background...almost always wearing a hooded robe (oddly enough).