Actually, the gyro is said to not move, because of the bullet like spin it should be the same as the fastball. There have been pitchers who would try and throw sliders,screws,sinkers, etc. and they would get the gyro spin. The spin looked like it made the pitchers pitch more effective, I believe i saw a clip of a Japanese pitcher who threw a sinker, like a gyro, and it had a great break.
