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Looking at Langerhans' data, you might wonder -- assuming the Fangraphs data is sound -- why he's so dreadful against cut fastballs.
Then you look at his trouble with changes, assume he's cheating vs FB's, and .... hey, I've never been in a pro batter's box. Maybe there's something about a cut fastball that makes "cheating" unprofitable?
In my minds' eye, I can remember a lot of Mark Langstons and Andy Pettittes who splashed on the league ... then faced adjustments by the hitters, and problems ... and who then got great again, and crowed about the value of a cutter.
I wonder if cutters are, in some way, the antidotes against hitters who are starting the bat too soon.