Ace, are you sure that guy in Nabakatsu's first clip is the same Master Wong you referenced? He sure looks different. Anyway, I agree with Mook that he looks pretty rigid doing the form, although I'd say more like hard-style kung-fu than karate. It also looks a good deal more circular and less linear in execution than the WC/WT I'm familiar with.
As for the second batch of clips... from Sifu Ng Chun Hong, that's energy I can relate to. Soft and flexible, constant forward pressure, and using one hand to control two. I like the way he keeps the pressure on with his footwork and uses his bong sau to deflect, trap and strike by folding into a gwai-jarn (kneeling-elbow strike). But then, that kind of movement is similar to what we do.