They probably did that because the "standard hex head" for that bolt would have caused a clearance issue. So they can use a 12 point head and reduce the bolt head size for extra clearance, especially for something with that much torque.
dont forget the rear main seal retainer on a BB....not sure why they did it in 12 point ...that has confused and been a show stopper to many when its greasy and you cant see exactly what it is :laughing:
