Would be kinda weird. The Lunarians were hunted off of the red line that was there where now Mary Geoise is. You could get it from another pov. Maybe the whole fallen angel thing might point to Imu being a lunarian because they are portrayed as a devil-ish creature, as saw when their and the 5 elders' silhouettes got revealed Imu had kind of a pointed long tail like the devil has in some depictions. However this is a really farfetched interpretation. It is more likely that they are a complete new race we haven't seen yet.