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A scout mentioned in the 11/08 JAC article that Pineda gets on top of the ball. How, you ask, considering he throws sidearm?
Check pictures #8 and #11 at the Four Seam Images link that Jon provided. Some other pitcher, at release, could have his wrist bent down a bit further towards the ground, even slightly under the ball.
After release, notice that the fingers have come over the ball at release.
Getting on top of the ball isn't a question of forearm angle. It's a question of making sure you don't cut under the ball and "sail" it, and Pineda's a great example of how a sidearmer does it right.