There's actually an interesting answer to this - the Phillies' biomechanics guy left for an assistant GM job in Japan before the season, and while they had other analysts, he returned to the Phillies and his old job on August 4.
“When I feel off, or stuff’s going wrong,” Wheeler said, “I really like looking at the biomechanics stuff because you can see a lot of different stuff, compared to the old-school video, that you might not see. They have the balls on your joints where you can see the smallest little difference.”
So, in the four days between one of the worst starts of his career and a much-improved outing Sunday in a 5-2 Philadelphia Phillies win over the Los Angeles Angels, Wheeler leaned on a trusted tool. An analyst, who was not a Phillies employee at the beginning of August, showed Wheeler a graph.
The ace was holding his glove 2 inches lower whenever he came set during his eight-run start against the Seattle Mariners. It had been trending downward all season. His posture was askew. It messed with his mechanics. He could not throw the baseball where he intended.
“So what do we do?” Wheeler asked. “Just bring the front arm up a little bit. Go from there.”