Here is, in part. the 2019 scouting report on Stewart (BOLD is mine):
Stewart filed a grievance against the team, which the Braves later won. Now, after pitching at Eastern Florida State JC in 2019, Stewart still has a chance to go in the first round, but he’s unlikely to go as high as he did in 2018. Stewart has shown flashes of the pure stuff he displayed as a high school senior—led by a fastball that gets into the mid-90s and his infamous high-spin rate curveball—but he hasn’t shown as much consistency as he did last season. Stewart has also added a slider to his repertoire, but it’s closer to an average offering while his curveball still has plus-plus potential. He occasionally uses a solid changeup as well. Stewart added weight to his lower half this spring, and while that increased his strength, some scouts believed it also hindered his delivery and increased the stiffness in his legs. While he has impressive body control, Stewart is not an elite athlete and teams think he’ll need to have more dedicated offseason workout plans to prevent his stuff or strike-throwing—which is solid—from backing up. Through 12 starts and 68.1 innings with Eastern Florida State, Stewart posted a 1.84 ERA with 96 strikeouts and 23 walks. He possesses all of the necessary talent and pure stuff, but there are many more questions with Stewart in 2019 than there were one year ago. Add on the fact that the Braves found a medical issue they didn’t like and that will surely leave some teams apprehensive this June.