It is possible that Sir Hellfire may be right about the heli-operation. Inserting troops behind enemy lines without backup is indeed done, and actually is the original task of para-airborne forces.
I still have doubts tho, because the Chinese will easily detect them and their forces will also reach there within no time.
However, I can confirm with (97% surety) Blacktop, Gurung top/Yellow bump is under Chinese control. In short, Nathan's analysis yesterday was indeed correct. They have a clear view of the entire Chusul general area as well from there.
As proof, I won't say I have X-contacts who I can't name. Have a look here
- (link) yourself. You will need a fine eye for detail and some interpolation skills to make sense.
I also did not notice any presence of IA on Magar hills (I can be wrong here, so not verified). We, however, have a sizeable presence in the Rechin La - Rezang La ridge area.