Back in the 1960's I SAW Jack Weaver shoot.
The Weaver stance is very natural, sort of a shoot however you happen to be standing.
It's much like a boxer's stance, right foot slightly forward, BOTH arms slightly bent, to act as shock absorbers. The gun hand is pushing forward, the off hand is pulling back in a isometric "lock".
What made the Weaver so good is, unlike the FBI "crouch" and the other techniques of the 1950-60's, the Weaver didn't use awkward or formal "Stances".
As an example, in the same 1960's I saw FBI instructors teaching the FBI method.
They spend a lot of time teaching stopping, lifting the left foot and moving it sideways several feet and just squatting into a deep crouch.
Also taught was holding the left arm across the chest to "Deflect or stop a bullet" while the gun was held at the waist one handed.
Weaver "blew them away" because in his method, while they were still getting properly stopped, positioning the left foot, and getting squatted properly, he was already shooting.
He just stopped walking and SHOT.
Also, in his method, he challenged the foolishness or allowing a perfectly good arm to be used as a bullet-proof obstacle, when it could be used to support the gun.
While they were holding their gun one handed and shooting using the instinctive pointing method, Weaver was blowing the target to bits by aimed fire with both hands locking the gun against recoil.
The main thing to come out of the California Big Bear shoots was the Weaver-Cooper technique which teaches NO formal stance. In order to eliminate formal stances like the FBI crouch, these shoots were specifically designed to put the shooter in situations where formal stance couldn't BE used.
One famous course that devastated FBI shooters, was a course that was started by pulling a large red handle. You ran the course, shooting at multiple targets placed in awkward positions.
The shocker was at the end. To stop the timer, at the end of the course was another red handle with an arrow pointing to the handle. The handle was in a tree, with a knotted rope that had to be climbed to reach the handle.
Half way up the rope, a moving target started. This presented the shooter with the option of dropping to the ground to shoot, or hanging by one hand and shooting.
Needless to say, "stance" shooters didn't fair well at these Southwest Shooting League matches.
What came out of this, was learning to develop NO formal stance, but to learn to shoot from any position, no matter how awkward, and to always use both hands and the sights whenever at all possible.
The Weaver was the most natural, and unlike the way some people teach it today, it's very natural and loose. Again, right foot slightly forward in a boxer's stand, both arms bent and using an isometric tensioning of the gun, sights used at least as a "flash" sight picture.