His stuff is insane. A 10 mph difference from the fastball to the changeup is really good. He is throwing up a 15+ mph difference. I can't think of anyone, off the top of my head, that does that consistently.
For curiosity, I just did some quick math (and may well have screwed it up, but here goes):
98 mph fastball takes 0.421016 seconds to get to home plate
80 mph change takes 0.515772 seconds
So, in 0.421016 seconds, the change travels 49.38 feet
Therefore (if I did this right) when the fastball reaches the plate, the changeup is still 11 feet from the plate.
That is insane.
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