i didnt say no mobility. please read. please read and then try to comprehend
i said a lead off stance has the least mobility when compared to a squared stance.
i also did not say that you would fight in a YKJM, but i was advocating a squared stance vs a sideways body
its easy to show. get in a lead off stance and try circling an opponent or moving forward or backward with small hops.
now do the same thing with a squared off stance. its easy to see which allows the most mobility
if you look at a person who can box and who is light on his feet. lets say ali. he will move around and circle around his opponent. when he does his legs come away from a lead off stance because its difficult to move laterally with your legs like that
then he stops circling and settles into his lead off stance, face to face, toe to toe and then he doesn't move much anymore.
im not advocating the foot shuffling, but look at how ali is when he's moving vs when he settles in to strike
http://www.youtube.com/watch?v=oD99VbFzqAg
obviously boxers have their reasoning for using a lead off stance to strike and WC has its reasons for a squared off stance when we strike, but the fact is that the squared off stance allows for better mobility