There are definitely different ways of teaching.
There are some instructors want a relatively decent or high level of relaxation when they start teaching advanced forms such as Chum Kui.
But from what I found is that the movements of advanced forms occur naturally and happen when one manages to maintain relaxation. Not just manage, mind you, but maintain that relaxation under force.
If the body is able to remain relaxed and free to move, then the body will move to either side when force is applied.
The concept is akin to pushing upon a balloon or air-filled ball floating atop the water. The various ways it resists and moves are simply remarkable. The joints – when relaxed and enforced with energy – act in the same manner.
The student needs the skill of remaining relaxed – but it is not as great as one thinks it is.