There is little acceptance of how to deal with KS via saddle fitting, different schools of fitting will approach it in different ways but essentially if you have no direct pressure, and space for the spine/TS to lift then it matters not, potentially, how that is achieved. It's ALL about posture, if you don't lift the TS, through preparatory groundwork, the feet and bodywork being right, and then the saddle/rider's seat not allowing continued lift, then you don't "fix" the KS.