I think they all qualify insomuch as they make use of natural features to improve the defensible qualities of the castles.
I should have said in my previous post that if a hill or rocky outcrop isn't present where a castle was needed, the earliest castle builders created their own, and the "Motte and Bailey" style was created. The Motte was a mound of earth, the earth coming from a ditch dug round the whole fortification, and the Bailey was a walled enclosure where ghorse could be stabled.
A tower or keep would be built on top of the Motte to provide shelter for the castle occupants, and the last line of defense during a siege. The 3665 Barons Tower could easily have a steck Bailey added to make it such a style of castle, and the ruined walls suggest that this is what the original building might have been.