If you go to the regicide mission and go up to the big door way where we first started out and the water flows backwards, there are three statues. The one on the right is supposed to represent crota, the middle Oryx and the left one your ghost can't tell you anything on. I reckon this indicates oryx has another son/daughter as powerful as Crota that we don't know about yet. Any thoughts? Or am I being retarded?