Sorry but I am kind of busy during normal days. After all we all train as much as we can, this forum is just for those hours where our body needs the rest or otherwise don´t work to fund our basic needs.
Anyways the things you posted about the video, I would like to say in my view you are trying to visualize this technique as if used forcible in a fight that is believed to occur just like in demonstration, it is not. There is an intent to do taan sau upon certain situations. That intent is felt through and if the moment persists it will become visible but otherwise it will move on to another movement. We dont do techniques in fight like some planned chess game.
You guys say this all the time, but what is shown is just moving straight forward with a man-sau that doesn't start out with the intent to punch. In fact, it is just walked straight into the opponent's arms like a zombie, thinking it's going to "wedge" things out of the way.
Actually the answer is yes and no, that "zombie bridge" is just a well used drill to
learn about the feeling and building up tension. (In this case to demonstrate)
Problem starting out with punching is that it will be flawed unless done with full intent. Full intent would cause many students to lose their body structure or start doing taan sau as a stressed technique rather than a natural move due to tension.
Starting like this, without the intent to punch from the beginning, the converted punch will lack speed, power, and accuracy.
This is just a drill, or in the video it is simply a slow description of taan sau.
That's the first issue. Second, he is walking straight up an occupied and well guarded center that he knows he will not likely just walk through. Why? He's walking into an obstruction knowing he will most likely have to convert to taan or bong or something else to get around it.
Pretty sure I said that elbow collapse is not part of what I am doing, just like in the movie there
is no just walk through attack here. It most likely look that way because of lack of intent in his student.
When you learn how tension works there is no point moving more than enough to exit the path of his punch and use that angle to attack him.
That may be "direct" but it's not intelligent. Nor is it efficient, because now he has to do several things in order to get around the obstacle he just mindlessly walked into. He has to change his shape, his footwork, his facing, his angles. Everything. Not so direct after all.
Not sure where you see this happening, he has a clear path to attack his opponent.
Only exception I could see was when he was talking about if an opponent pushes him hard,
something his opponent did not do which made it look rather odd. @0:40
(I think this comes from a misconception of man/wu and an obsession with occupying the center, all due to missing elements of strategy. Cham-kiu, seeking the bridge. Many interpret the bridge as contact with an opponent, so they walk straight forward with outstretched arms expecting to run into contact and work their chi-sau skills. For me, the bridge is the most simple and direct path to the target. Has nothing to do with touching arms, and walking straight up the middle into an occupied center is not it!)
This you need to show what you mean it should have been, but keep in mind that scenario of walking in
like a zombie is nothing more than simple drill to get basics. Advanced use is for more live action drills.
Also note that taan sau only exist for a very short moment in case of punch. If it even becomes a taan sau at all. Not all techniques are always needed against a quick jab however.
Third, his arm is converted to taan before he steps through and punches, or perhaps as he steps, but before the punch. Problem is, from the moment contact is made with the lead hand, both people have the same amount of reaction time. It will come down to which of them is faster, more direct, and powerful.
Taan sau has nothing to do with the punching. Taan da or not to taan da, the situation decides.
Stepping through like that isn't going to be fast or powerful. It's a full step forward changing direction, alignment is broken during the step and the punch has no base behind/under it. And obviously it isn't direct, as it's moving around an obstacle.
So you never move to the sides, sidestepping in towards your opponent? If you do, you will notice that body structure is intact all through the movement and in many cases, but not all, the power of such a move is present in a punch as well.
For the opponent, @0:35 say, all he needs to do is sharply jat+punch to cut him off and knock him out with a direct power shot before any of the rest of his idea gets to play out. Simple, direct, done.
Yes his opponent can, and then he can react to such a movement. There are no unbeatable techniques.
Keep in mind that if you want to train taan sau, you need to do so in a scenario where you can prolong its existence.
Everyone can make more moves. I usually see it like this, if I make a move, you can make a move. When you made a move that leaves me the option to make a new move as well.
Please, those kind of comments I dont even know how to counter because they are unrealistic. If something changes then taan sau is no longer kept, believing anything else would go against WC/VT and you know this well enough.
He has proven that he cannot carry on a coherent and logical conversation. On to other things! This thread needs to come to an end.
Just didn't recognize till I'd acquired more time/training/experience. Ce La Vie I reckon. 
