Not to go off thread here - but the point about one handed v. two handed shooting Ive kinda evolved or devolved on that exact same point.
I know a guy that does a lot of Youtube video stuff an old comp shooter - he brought up a point when he was talking about grip - his firing hand does the same thing as when he does offhand shooting and he refers to his non firing hand as merely an assist to the firing hand.
My jury is still out on that one but im inclining towards it. We diverge on several little things like firing hand grip strength and Im more of an Isosceles shooter and he's more inclined to the Weaver stance
(techniques are not fundmentals - if it works leave it alone)