ive seen master zhendou as he does from the wuji position going into ward off right
I just wanted to add some clarification to my previous post.
First, I do not recall Yang Jun and Yang Zhenduo showing any significant differences in this sequence. Although their teaching or the emphasis in their teaching may have changed slightly over the years. You should be able to view these movements in detail in Yang Jun's video.
Second, our names for the full sequence would be: Preparation, Opening, Ward Off Left, and Ward Off Right, so I may have misunderstood what exact movements you were referring to.
Some people refer to the Preparation Posture as "Wuji," but I personally do not like this practice for philosophical reasons. As I understand it, the term "Wuji" can refer to two closely related things. It can refer to a state where Yin and Yang have not yet separated and are undifferentiated. To me, this term properly refers to the state you are in with respect to the form before you actually conceive your final intent to begin practicing it. By the time you assume the Preparation Posture, you have already left Wuji and have entered Taiji, since now there is clear differentiation between doing the form and not doing it.
"Wuji" can also refer to a static symmetrical posture, since the term "Taiji" inherently refers to a state of constant change. Although our Preparation Posture is basically static, you are supposed to be actively observing the Ten Essentials, which include physical aspects. You are not so much still, as actively entering a new state of equilibrium where you feel taller with longer arms, a sunken chest, broadened back, and loosened lower back. You begin sinking Qi and raising your spirit in a way that sets up a strong circulation. You actively focus on empty and full, internal and external, upper and lower, stillness and movement, etc. I think "Taiji" is a better term for this state than "Wuji," even though there are no large movements.
I also know of some practitioners, who actually have a posture or sequence of leg movements that precedes the Preparation Posture. They call this "Wuji opening up into Taiji." If I recall correctly, the sequence is the same as or similar to the way students of Chen Man-ching's teachings begin the form, with heels together, feet at a 90-degree angle, and arms dangling loosely at the sides. I, personally, do not practice in this way; but recognize the validity of the philosophical point this sequence emphasizes.