Paul DeJong has been a steady contributor for the Cardinals since exploding onto the scene in 2017. Much of his inflated numbers that year were due to an elevated and unsustainable BABIP of .349. He settled down a little bit in 2018 to post a wRC+ of 103 and has been producing at a similar level this year (104 wRC+), but the improvement is evident.
DeJong has shown some major signs of maturing at the plate. In his rookie season he struck out a lot and hardly walked. Even though he was successful, he may have found his success difficult to replicate unless he improved his approach at the plate.