FWIW I thought the best part of Alans clip was when he mentions the practicality in function of chained strikes being akin to the speedball training of a boxer. Learning static drills of lien wan kuen to develop a habit is one thing, and being able to apply this method in the thick of it is another. I agree 100%
But I will add that there seems to be confusion about the language implication with this sort of fistwork. Not so much from Alan, but from some of the posts here. 'Lien Wan Kuen' implies that the fists are linked and revolving continuously, More of a 'stunning' method for fast hands. If, like Alan, you are well versed enough to react to an aggressive fighter and continue to link up these fists you are doing something right
but this isn't 'only' Lien Wan because there is an element of receiving and giving pressure too. FME and learning we referred to this method as Seep Dai and this is exactly what Alan acheives here, continuing to express his Lien Wan fist work while receiving continuous attacks in different ways.
This is called Seep Dai Lien Wan Kuen.
So to be clear on the 'power' thing. If you are charging through the defense continuously, with pretty much no regard for what's coming back atcha, this is called Lien Wan
Chong Kuen. If you are stop/starting (but still quite continous) like in the clip you ar doing Seep Dai Lien Wan Kuen.
Both are simple ways of expressing the Wing Chun Fist, and both are present in Alans clip just not the only methods available to us, as (I think) Yoshi was also trying to explain.