The five elements are not the cogs, they're nonsense.
The 5 element theory does not reflect how the world or the human body actually works -- and to try to base your martial art on it is silly.
You've "redefined" the five elements to be eye, hand, body, waist, and leg.Sau, Ngan, San, Yil, Toi - Hand, Eye, Body, Waist & Leg.
ALL are required to even 'move' your WCK and each are drilled to perfect your WCK.
As an example, the SNT that is generally seen is a practise of the Hand and Eye. The Body, Waist and Leg are kept 'steady' but are not moved in any way. This is using 2 elements BUT to actually APPLY the SLT needs all 5 elements to be in use. ie. MOVING!
How do you train that? And what would your SNT look like then?
The kuit tells us: Siu Nim Tao Lien Yiu Sen Ma - Siu Nim Tao trains the waist, torso and horse. The bridge hands are only extensions of the waist, torso, and horse. A tan sao, for instance, isn't just an arm movement but a whole body movement, and to perform it you need to use your whole body (it all moves).