You can add Philipp Bayer to the list, as well.
I actually trained for a short while with a PB student, a guy named Desmond Spencer. He was really good, however I left after a short while to train with Leo Au Yeung. Found the system under Leo had better use or energy, movement and power. Prior to Training with Spencer I was with Niņo Bernardo linage.
You can see him here in Thailand sparring, http://www.youtube.com/watch?v=Nbi3mMA7LkU
Sure, I not trying to be disrespectful at all. At the time I had seen nothing better than the PB approach, in terms of hand speed and technique.
However I was drawn to Leo Au Yeung, at the time I was already an experienced WCner and when I met Leo he was able to move me around with great power. This power did not come from physical strength as I was bigger and stronger than him, it came from the way he used his lower body and core, similar to more traditional Chinese martial arts I had seen (I have trained in China with some of the older arts). This made me want to learn this approach.
He has soft hands are like most Ip Chun students, but the difference was in his power and movement. His linage explains this, he learnt the system under Ip Chun in Hong Kong and inorder to go deeper into Wing Chun he learnt from Sifu Sin Kwok Lam, that where he learnt more about movement and generating power from the core.
Maybe im looking at the wrong clip, at about 2.45m mark there is some light sparring betwee the gentleman in question (i believe) and his trainer, the last minute or so is him talking with his students in the back ground drilling that is not the same as a clip of students he has produced fighting full contact in events
Im not having a go or being awkward but you said he should be added to the same list as Alan Orr and Phil Redmond when it comes to training students who can fight...both those gentleman have posted clips of their guys in full contact events against students of other schools so thats the yardstick used to judge i suppose