Why do you guys keep ignoring the fact that Alan has demonstrated a visible effect on the opponent's balance by control through the arms?
Just look for the effect on the opponent. That's something easily seen and pointed to in a video if it ever actually happens.
Actually no. He has demonstrated and effect in chi-sau context. Have you gotten any confirmation that this is the same effect expected in actual sparring or fighting? I have not heard anything of that sort, assumptions are not my way in this matter.