Bert,
Great question. Brandel has a real love for the movements of Jack Nicklaus and other great players. As you might be aware, Jack Nicklaus played from a slightly open to square stance. We would argue that our movements are much easier to accomplish from a stance that is slightly closed for the normal player. Jack Nicklaus executes the Tathata movements from an open stance which is more difficult but just as effective.
As discussed in Chapter 1, although we suggest a stance where the back foot is slightly dropped back, we can also play from a square stance or even slightly open stance. The movements just get more difficult to execute the more open your stance is.