The “greys” that are common in eyewitness reports are not the actual aliens, but are semiorganic automatons created by their masters who control them via advanced forms of remote control. This is betrayed by eyewitness reports of their strange movements and stoic attitudes.
The Greys (Sheti) work for the reptilians. The purpose of the abductions is to analyze and get samples from many Earthers in order to use what the aliens find "useful" from the current population to incorporate into the next intended residents. Forget the old 'dying race' crap that the Greys like to use to trigger sympathy for them with Earthers. That is a smoke screen. They hybrids they create are not the final product they desire, but they are a step in the direction that they seek.
These are Grey aliens and they have a hive mind...The hive mentality is the height of conformity and an icon of several sequential alien groups. Individuality is not found with these types.
Next that I want to draw your attention to is the type of Grey aliens (Sheti) that has been shown in the first two episodes. This was not the type of alien that crashed in Roswell, but this is the type that the government wants you to focus on. They are part of the Orion Empire. The Grey shown in these episodes is a violent type. Also note the man in the small room where they are holding the alien. He's chanting away in Hebrew. The interesting tie here is there is the "Jehovah" alien group that has a distinct interest in the Israelis. Draw your own conclusions here.