and there is no reason a pitcher can't throw drops (any style) and rises.
Theoretically, no. Practically, for a 21U pitcher, it is very difficult to throw both the rollover and the rise and get good ball movement.
The basic problem is the body position to throw a rollover as opposed to the rise. If the body position relative to the arm isn't right on either pitch, the ball will not move. With a rise, the pitcher has to be back. With a drop, the pitcher has to be forward.
At practice, where the pitcher is throwing 50 drops in a row or 50 rises in a row, you can eventually get the pitcher to throw the desired pitch.
During a game, when the pitcher has to throw each of these pitches several times an inning, the body position gets messed up, and the ball stops moving.
Most are better at one or the other but that is often a matter of working harder at one than the other or using one or the other more based on early success.
If a pitcher has an infinite amount of time, she could throw both. She doesn't.
Most pitchers who try to learn both end up not learning a breaking pitch.
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