I came here to learn more about Wing Chun. In my brief time practicing WC, there were many principles that fit in well with my other training (connecting, adduction) and some that did not mesh at all (100% weight on rear foot.) I left that school; not because of those differences, of course. If I return to WC someday, I'd like to check out other branches. If your system pivots on the heels, toes, or left butt cheek, I don't care. IF you can explain why, make it work, and teach it, I'm open to it. Not because your sifu said so and he is the one true way. I don't care at all whose style is closer to Yip Man, or who was a student of whom.