I saw one of his starts against the Snappers and I have yet to see a pitcher in the minors who was dominating even when he walked 5 guys in 2 innings. Hitters were consistently ahead in the count, yet they couldn’t make hard contact. His stuff was so nasty it looked like the hitters just prayed for a walk realizing they couldn’t hit him. In addition to the stuff, he has an athletic delivery that made the ball hard to pick up.
To me, an athletic delivery means a delivery where the pitcher doesn’t come to a stop in their lead leg at the apex of the leg lift, their center of gravity if moving forward at the apex of the leg lift, and the arm action is continuous and seemingly effortless.
Deception comes from a lot of different things, but in this case, I was referring to the fairly slow and methodical delivery w/o much wasted motion which gives the sense of effortless. Then the ball flies out of his hand in the mid 90’s after a slower delivery which lulls the hitter into expecting lower velo.