I am not sure how you are defining IS/IP. Our training has always been and will continue to be dedicated to developing Ki.
Although the understanding and use of ki is integral to effective development of IS/IP, it is not the only thing required to develop IS/IP. Actually, ki is just part of the process that leads all movement; external as well as internal. In IS/IP development the conscious leading of ki with your intent is a core part of re-mapping the normal external movements to internal movements for a given response.