Also, it should be noted that the robot can only last so long without a charge and has a lock against thoughts of trying to take over the position of the original creature. If they meet the one who they are impersonating, the system automatically shuts down (though the organic layer does not deteriorate) - in a way, it knocks out the copy if it sees the one it's trying to be. It is just a prototype that Aura made before his journey. He'll be back later to hopefully finish the experimental drone :D
You can tell the difference by the + sign etched into the forehead and belly button, though it can still be hard to see if the target usually covers those areas.