When he said "elements" I believe he was referring to WC-like techniques or strategies included in certain fighter's arsenals, and was not referring to particular fighters.
I have seen some fighters effectively use techniques that are in the WC arsenal ....but of course these same techniques are also found in many other fighting systems. Personally, I don't know of many fighters who claim to have taken techniques specifically from WC, but then I don't follow MMA closely.
It still seems to me like Boxing, Muay Thai, and BJJ/grappling are still the primary sources for functional MMA. Again, I'm pretty ignorant about this, so feel free to educate me!