Originally Posted by jbourke
I don't see any reason why the plane would prefer one roll orientation over another.
Well, once a wing is lost, the plane will still need some positive AOA to fly. In this setup apart from the drag considerations from the remaining wing, the wing that is left will tend to weathervane in the airstream. This will tend to make the plane stabler in KE when the wing that is left is kept pointing upward, it might well be impossible to do any maneuvering with the wing pointing downward. Any pitch (yaw now?) will tend to get the plane rolling through 180 degrees