You make a good point. The grip has as much to do with which fingers are applying pressure and where, then as to how many are making contact.
Trevor Hoffman's "box change" has all five fingers on the ball, pinky and index finder on the sides, middle and ring finger on top, thumb below.
Myth buster extraordinaire,
Some clarity as to who “many people" are, would be informative. Perhaps a large number of noted pitching instructors who say the ring finger should never be making contact with the side of the ball when griping it with your index, middle finger, & thumb?