Wow, really? There are Wing Chun systems with no empty hand forms? I hadn't heard of those.
Sifu Leung Jan reorganized the way he taught Wing Chun in Ku Lo village at the end of his life.
It wasn't JUST taught as ad hoc short sequences of techniques for drilling.
Each of the San Sik sequences in KLPS has a specific body mechanic, intent, "theme", "gong", or whatever you'd like to call it.
Leung Jan took this into careful consideration when he designed the San Sik.
They are progressive in nature, meaning you work on them in a particular order and they develop your body and your "gong" in a specific way.
Each San Sik has an accompanying two man application drill so you know exactly what it is training you to do.
Some of them have more than one way to train them as two man drills.
Each San Sik is also applied on the dummy. So in KLPS you start using the wooden dummy right away. Like on day one.
You don't wait for to be 3 handfoms into the curriculum before being exposed to wooden dummy practice, as regular WC would have you do.
And of course each San Sik is applied in Chi Sao (Sticky hands) as well as Jao Sao (sparring).
Leung Jan knew time was short at the end of his life and has a very narrow window to pass on the culmination of his life's experience training and fighting with the art of Wing Chun and he came up with an ingenious and effective way to do this.
Each of the 12 San Sik contains one cycle with 3 motions, or 3 separate points, totaling at 36.
Each Small Set may be practised Solo in the Air, Solo on the dummy (Jong Sau), in a 2 man set, and with the Yee Gee Dao.
If I had to define Leung Jan's art... using musical terms. He created Jazz. While he used traditional forms for the source he broke them up and allowed to keep the techniques.
It was live, it was improv but rooted in standards broken into bite sized bits.
Leung Jan earned the title of “Wing Chun Kuen Wong” or "King of Wing Chun Fist" over the course of his life from winning over 300 challenges in which he remained undefeated.
He retired to his home village of Ku lo, after selling his family business (a medical pharmacy) at age 73, In 1883 according to my notes, but most say 1885.
This is when he taught the last of his students, who were mostly relatives.
It is also believed by most WC historians, that, during the opera ban in post-1855, Leung Yee Tai and Wong Wah Bo lived in the surrounding area of Foshan.
At this time, Leung Jan continued his WC studies (started post 1840s), and some oral traditions credit Leung Jan alongside his second teacher Wong Wah Bo with creating the three hand forms which are the main vehicle for the transmission of the Pin Sun Wing Chun system.
When Dr. Leung Jan's pupils would ask what the difference was between their boxing and the boxing outside their village Dr. Leung Jan would say;
The Wing Chun outside our village is the Jing Sun (Straight Body) "Facing" style, which is divided into three parts; Siu Lin Tau, Chum Kiu, Biu Jee. The Wing Chun from our village is the Pin Sun (Side Body) style, which is taught in one part but differ very little and are really from the same family!
The pole method of the Facing style is the Luk Dim Boon Gwun (6.5 Pole) but in our village it is the Som Dim Boon Gwun (3.5 Pole).
Over the next three years Dr. Leung Jan taught his students all his skills but unfortunately, do to old age, passed away at the age of 76.
His most senior student, Wong Wah Sam, went on to teach Fung Chun, Fung Min, Fung Lim, Koo Siu Lung, and others the Pin Sun Wing Chun art.
Fung Chun, the last living grand student of Dr. Leung Jan, is now retired living back in Koo Lo village where he is the head of the Fung family Pin Sun Wing Chun clan.