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Stretching the depths of my memory here but I believe stuff is based on the pitch ratings. So it maybe a pitcher with two dominate pitches gets better stuff than a pitcher with 2 dominate pitches and a crappy pitch. I could be wrong but I think beyond determining stuff it only affects if the game thinks a pitcher is a starter. If I remember right there is a min rating on 3 more pitches for a game to call someone a starter. That is why young pitchers sometimes project as bullpen but become starters when the third pitch gets good enough.
I am not sure the pitch ratings or number of pitches works directly into performance. I am pretty sure it affects stuff and stuff, mov, con affect the stats.
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