Then point to anything in Sanchez's minor or major league track record that actually suggests he is capable of taking the next step.
Analytics or not, Sanchez has yet to harness his tools. Expecting a sudden leap based on nothing but a narrative of "well he's young so he should improve, right?" that another poster suggested doesnt make any sense.
That's not analytics or even traditional thinking, it's just blind hope.
He still has the same running fastball he can't really command, a curve that isn't effective enough and a changeup that's basically useless because of his poor fastball command. That lack of effectiveness from his secondary pitches is a large reason why he doesnt miss bats. He's working on a cutter, which would help him alot if it's becomes reliable to actually have a pitch that moves to his glove side and that he can keep inside to lefties, but fastball command is still the big problem.