One plot point in LOCH was how MCF desired the internal energy secrets of QZ. She tricked Ma Yu into explaining a bit and later made GJ tell her more before she'll help him.
MCF's disciple was YK who trained for several years under QCJ. Didn't MCF know he learned QZ internal energy? Even the 7 freaks noticed when GJ learned QZ internal energy for just 2 years. MCF should've just asked YK.