Sorry for delayed reaction I don't read forums as often, but I am an avid enthusiast and practitioner of both wing chun and BJJ. Thanks for the video posted above and exploration of concepts. I've been kicking those around for a while.
First off, closed guard and wing chun. The skillsets built in wing chun on the bridge with wrist and forearm detection and reaction are always applicable in grip fighting from any position, and as you demonstrate work with standard tan, bong, fuk for dealing with punches. However, you have two opposing fundamentals going on from closed guard - wing chun's primary idea is centerline and striking. For BJJ, getting offline off of centerline from closed guard is the predecessor for setting up attacks.
However, if you go deeper into wing chun concepts, like my lineage teaches, centerline when you add the detail of a height reference, basically connects 3 centers of gravity of the human body, or the 3 dan tiens. The top is the head area, or the upper lip right under the nose, the middle is the chest or mid sternum area, and the lower is 3 inches below the belly button. If you start to think of centerline as the control of those 3 primary areas it sets off all sorts of fireworks mentally IMO.
For instance, centerline theory from wing chun focused on the upper dan tien area and the control of it and attacks basically consist of the rubber guard path.
Centerline theory focused on the lower dan tien area and the control of it and attacks basically consist of lockdown half path.
To me centerline theory focused on the middle area of the body consist of more of my butterfly guard game.
This is just guard.
If you go to considering the back, centerline principles would consist of the concept of back control, the truck, and twister control and the control of the opponents center thru the transition in these positions.
The overall goal of wing chun and the overall goal of BJJ are different IMO. For instance, chi sau or sticking hands - in wing chun there is attachment to the opponent thru sticking on more of a temporary goal, to control the opponents center to hit. In BJJ, it is to control to clinch.
IMO the real gold in this type of comparison and development of parallel skills lies in Combat Jiu Jitsu. Keep developing my friend it is a great path.
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