I was trained in the JKA / ISKF style of Shotokan with very deep stances. My knees are not as healthy as they once were, hence I desire to adjust my kata to a form that will reduce my discomfort and extend my karate practice. Simply emulating Iain's kata seems to me a pragmatic starting point. Functionally, it seems it would be as simple as, "just change to cat stance" or "just shorten your front stance," yet, I have already noticed some footwork and balance differences. If anyone has already "switched" in this manner, please offer advice if you have some. For the people who began and continue to practice with the "Cat Stance" versions, any insight you have picked up would of course also be welcome.