Bernard, I'm glad you had such a positive experience with my Sifu, but your description of I Liq Chuan is quite flawed. I don't have enough time to address each point by point, but Dan Tien is fundamental, and there is no Taiji or Yiquan influence. This comes up a lot, but there's no direct connection.
That's why I tell people to go meet him and train with him. ASK!!! He is accessible and friendly and can use it. There are several of my folks with him right now In Massachusetts.