You are correct, other teams now know his batting style, but his fielding is still a Keyston Cops routine.
It does not matter if he makes the play, eventually , the extra time it takes him to throw to first, is all some batters need to beat the throw.
His throws to first need a large First Baseman to stop them from being a wild throw.
In the Post-Season, i hope he is a DH, or replaced during the game when fielding skill counts.