to be or not to be pigeoned...
sh, 2 reasons why pigeon toed is done in the beginning....
1) by being in pigeon toed stance, its easier to turn or shift
2) not being in pigeon toed stance, you no longer create a pyramid base structure
as for yipman breaking this rule, this is a case where if you master WC, you can break the rules....his adjustment is so fast and timely its not necessary for him to keep it pigeoned toe...
not that i've master the art, but i can get away with not being in pigeon toed when i chi sao and still adjust at the same rate if i were....