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Felix' changeup, as we both know, isn't a "changeup" in the conventional sense. It's a power spitball that is almost as fast as his fastball.
The one slow pitch he has is the 83 curve, but hitters don't generally swing out in front of curves; they freeze on them.
Felix has never been particularly good at catching hitters in between - that's for sure. (IMHO, the Padres game, they were never in between at all, loading up and timing the ball correctly every swing.)
A forkball would be so nice to see. Clemens learned one later on. Imagine the garbage swings on an 80 MPH forkball.