Let me first say that I have seen one very good IKCA practitioner, and he doesn't move both feet when executing his forward bow, and yes... WARRIOR SAGE has excellent basics. I love training with him, mainly because he is one hell of a nice guy.
I don't know how the IKCA teaches the forward bow, but I do know how the forward bow is taught in the Pasadena Studio, Frank Trejo's Garage, Larry Tatum's Studio, Bryan Hawkins' Studio, the infinite insights, and the sophisticated basics videos (both of which were produced by Mr. Parker).
The forward bow, when executed as demonstrated by Mr. Parker in his American Kenpo System is effective, stable, and powerful. Let me first explain the mechanics involved in it's execution.
1. From your neutral bow, assuming that you are doing it correctly, you turn your back foot (and only your back foot) so that your toes are facing 12:00, and straighten your back leg (locking it out at the knee).
2. Maintain the position of your front foot so that your front toes are at a 45 degree angle to your center line, and shift your weight so that 60% of your weight is on your lead leg and 40% of your weight is on the back one.
There are a couple of advantages to maintaining the position of your lead leg. The first benefit is an automatic positional check. Your front knee is covering your groin against an incidental strike from your attacker's lead leg. Second, it offers lateral stability. Even though it is temporary, and a minor difference at best... every little bit counts in a fight (Why wouldn't you want to maximize the effectiveness of your stance?) The third benefit is that it limits the rotation of your hips and keeps a practitioner from over rotating while executing this stance. Over rotation causes several things to happen, including loss of power, loss of stability, and loss of correct body alignment (all of which decrease the effectiveness of this stance in a fight).
These are my views, although shared by many... I hope it helps to clarify my position a little bit.
Sincerely,
Billy Lear, UKS :asian: