WCK rotation isn't like boxing
If you do the forms and exercises of WCK and examine the rotation (body turning), you will see that in WCK we keep our shoulders always directly over our hips, even when turning/shifting. When we turn/shift, our hips and shoulders turn at the same time as a unit, always maintaining that shoulder-directly-over-hip alignment. This is the basis for WCK's "connected power."
In boxing, however, you see the shoulders often move independent of, although in conjunction with, the hips. So the upper torso will twist more than the lower torso.
These are two very different ways of rotating and work differently, in different circumstances, etc.
Why does WCK rotate the way it does, and in a way different from boxing/kickboxing?