While the shot itself is static (though maybe stamina plays a role?), the way FT's are generated is actually a result of the offensive flow. If a player makes 9 great drives and is fouled 9 times, and makes all 18 FT's, but also takes 1 jumpshot which he misses, should he have high or low PP100? Fouled shots do not count as Field goal attempts, but who says PP100 only counts field goals? There's a lot happening in the game engine and only a fraction is visible in the box score.