[QUOTE=Steeeve;971411]well
mostly every WC guy position their fuk sao to the tan sao wrist ,
now whats about position your fuk to the middle arm of the tan sao
more control …with forward pressure…and you nullify the bong sao if u want
i just ask about that…whats u thing :)[/QUOTE]
thats because mostly every WC guy is using wrist energy to wrist energy in an incorrectly applied drill…leading to hand chasing, over trapping etc…common.
VT is striking…
The distances of dan chi-sao drills are greater than chi-sao lok sao drills due to the impact using contact with the partner not being introduced yet…the dan chi-sao is about learning to use the alignment of your strikes to do multiple tasks , iow, strike and use the arm positions along the centerline to be a defensive position.
So the initial contact area will be wrists to wrists but that doesnt matter , what matters is that you dont use the wrists to deliver the energy of the deflections…you are far enough away that you wont hit each other if the guys bong is slow etc…impact comes from moving closer in the more advanced stages of training…
Dan chi-sao becomes redundant after doing it as a learning curve, iow you no longer adopt the further distances of wrist /wrist contact points…and no longer do 2 beat strikes …thats an introductory level for alignment of wrists and elbows for striking with later in fighting…
the strikes go from 2 beats in dan chi to 1 beat with 2 actions per strike per arm…for fighting later.
The idea that your feeling with the wrists and rolling the energy is completely wrong, its an idea developed by those with little understanding of the process for fighting…
Jum sao comes from the resting fok sao…so fok sao is really just a neutral arm position for the WC drill…
You have a fok sao ( neutral elbow) resting on the tan ( outwards elbow strike )because the stimulus/signal to do jum sao (inwards elbow strike ) isnt being sent…
the signal is tan attempting to strike forwards , when the arm feels the signal the fok stops resting and disappears altogether because it is now a pre-strike position for inwards elbow training …iow its no longer fok because you have ENERGY in the arm
regarding the fok position after doing dan chi and moving closer doing lok sao etc…:
If you are close enough to use both the elbow idea in development and strike/contact the partner with force …iow if you are capable of using inward elbow as you strike then you will have your wrist [ not that it matters] in the forearm area , because the elbow doesnt move back and forth …and you are now able to use an elbow and make contact with the partners chest to develop IMPACT & ELBOW positions simultaneously.
Many start the whole dan chi..lok sao etc.. with the idea that you feel and roll energy around , trying to turn it by adjusting the stance to deflect the energy..all wrong.
You start with the wrists and think its about feeling things at the wrists and countering with energy at your wrists and hey presto your wasting time for years 
the fighing system is lost in a quagmire of chi-sao games.
VT requires a person to coach you OUT OF USING THE WRISTS incorrectly…if you dont learn this you will easily be shown by someone with alignment skills…becasue the writs will leave the line in attempts to stop the incoming lines of strikes with ..WRIST ENERGY…
if you have the knowledge then your confidence levels increase exponentially due to the simple fact that you can see the genius of the system …and it aint rolling around feeling a tan with your fook .
Its about fighting , brutal , quick and effective .
If you get lost in the sticky rolly world of chi-sao you end up with little confidence regardless of all the ‘moves’ you have …your heart will be the guide, follow it.
