Yeah, because SWAT is just make believe right? :bier:
Here's the thing. Take Datsun's grip, it may "work" for him. But as far as grips go, it's about a step above useless. The support hand isn't supposed to be just a rest, it's supposed to help control the gun during recoil.
Your text book isosceles, weaver, whatever stance may not work perfectly for all, but they can serve as a starting point to find a modified position of such that does work for them.
If someone is using a comfortable grip and shooting like dog crap, maybe they need to try an uncomfortable grip, watch their groups improve and work on making the grip/stance comfortable.
I've seen people rant and rave up one side and down the other about how great their "stance" is and how they refuse to change, but when I see them shoot, the gun is jumping out of their hands and they can't hit jack squat. With a little adjustment and an open mind, their shooting improves.
Case in point.
Lima before instruction
Lima after some instruction
What happened in between those two pictures? (Her hair changed color :rofl
http://www.defensivecarry.com/vbulletin/general-firearm-discussion/22406-stance.html, more instruction, learning, and more range time.
http://www.defensivecarry.com/vbull...o-firing-line-range-report-myself-my-gun.html
http://www.defensivecarry.com/vbull...-two-day-general-defensive-handgun-class.html
Now prior to learning more, her accuracy was acceptable, and to her "worked just fine", but after some experimentation and LISTENING to other shooters/instructors, her performance improved 10 fold.