zero shift on the elbow plane

[whip]

I realize that, to clarify, my question is how many tour players DO NOT SHIFT to steeper planes and remain on the elbow plane from startup to finish, i would guess very few if any but was curious if there was a player out there to study from, who employs a zero shift elbow plane swing. from my first post, my question is are impact conditions the same when employing a double shifting elbow plane-any steeper plane as employing a zero shift elbow plane swing, I'm thinking impact conditions with regards to spin and hinge action would be the same because with both swings impact occurs on the elbow plane.