Like I said - no torque to the skis needed to reposition the skis... it's just the biomechanics of edging, as I explained already... our body's segments re-arranging due to simple movements of the turn like edging - which have nothing to do with applying torque to or twisting the skis... it is simply not the same as rotary, but a different category.
There's always a torque required to initiate rotation of the skis. You just have to figure out where that torque is coming from. Either, the skier does it through counter rotation, or the snow pushes back against one part of the ski more than another part. This argument of passive pivoting is possible when the skis are on the snow, but not in the air. Once you go in the air, only the skier can initiate a rotation of the skis by applying a torque. There's no evidence of building up angular momentum before he goes into the air. Those skis are going straight until they are airborne. Then when they are in the air they rotate, which can only be done by the skier applying a torque. For this to be all passive you would have to see rotation on the snow in the correct direction before going into the air.
It may be that some of your biomechanical blah blah blah is just your way of describing how the skier applies torque to the ski in the air. That's ok, but rotation in the air is an active pivot no matter which muscle groups are used to apply the torque.
I didn't want to get into this question in the first place, because I knew it would be like walking through mud, so I'm going to leave it here.