Dont see that stance anywhere but kung fu. (which is fine. I am just arguing this take down idea that so far doesn't really add up)
Does you expert who endorses that stance use that stance?
I don't even understand what you are saying here. Don't see what stance anywhere but Kung Fu? The video was showing a wrestling stance! Does the expert use what stance? I'm sure the wrestler uses a wrestling stance...against wrestlers, and the Wing Chun guy obviously uses a side stance. So what are you even talking about?