Although your question wasn't directed towards me. My opinion is some aliens are the fallen entities known to Enoch as the Watchers, along with the possibility that the "Greys" are their genetic creations used like drones. You may enjoy the work of LA Marzulli, Timothy Alberino, the late Thomas Horn, or the Faull Brothers. The documentary "Higher Entities" is a good place to start, here is a link to the presentation.

https://rumble.com/v4phipn-higher-entities-the-lost-tapes-documentary-see-notes.html

Although your question wasn't directed towards me. My opinion is some aliens are the fallen entities known to Enoch as the Watchers, along with the possibility that the "Greys" are their genetic creations used like drones.