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When using the Right Shoulder to launch the Driving Right Arm, Palmer, Stadler and Trevino are Four-Barrel Hitters, not Four-Barrel Swingers.
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It seems to me that Stadler is more of a hitting-swinger, who pushes then snaps release.
The Snap Releases -- both Non-automatic and Automatic -- are available for both Hitters and Swingers.