[12 piece bucket]

No player, other than a 40+ hdcp., has the shoulder stop. When you look at the 3-D models instead of making assumptions in watching 2-D video, there are periods of acceleration and deceleration in every segment. When the arm accelerates off of the shoulder, the arm can cause the shoulder to rapidly decelerate but not stop. Just because something is moving doesn't mean that it's not slowing down.

When a major league pitcher throws a ball, the shoulder doesn't stop when the arm begins to throw. It's a faulty assumption to believe that a Hitter's shoulder can't continue down-plane.

Some of us use 4 barrels. And, Homer said it was possible for Hitting.

Good post junebug....agreed many have a caricatured view of what hitting "looks like" and how it "works"...as if somehow the hitter don't pivot....I will always remember your quote..."Is it easier to push a cannon ball that is still or one that is rolling?" what alignments do you focus on when determining if a player may be hitting vs. swinging?