Actually I'm wondering about this.
I have this pitcher, Alvare Casteles:
And his stuff is a straight up 255.
But his K/9 is only "above average", especially by modern standards. I mean 10 K/9 isn't even top 10 in starters this past season.
At first, I thought maybe my league just needs more K's (and maybe it does, though hitters are already striking out a LOT, even by modern standards).
Castelles has six pitches. His 70 Forkball and 80 Circle Change aren't showing.
But then the Cardinals have this guy, Marc Tatum:
He also has a straight up 255 stuff.
And he's posting Gerrit Cole/Max Scherzer type numbers in K/9.
Am I just seeing the "flavor" that No One was talking about?
Neither pitcher has a knuckleball, but Casteles has far lower BABIP allowed consistently, while Tatum has a splitter. Is that splitter helping Tatum keep a higher K/9 while Casteles' profile is more "extreme deceptive" and he's better at inducing bad contact when he doesn't miss bats completely?