I was watching Sunday night Baseball this week, and Curt Schilling was breaking down David Price's delivery. A point he made was he's "windup, windup, go". Price is very collected in his pre-pitch and even into his leg lift, and when he drops there's no waste movement. His body works as a rubber band, he extends down the mound, and then bang, he lands and the ball is coming.
The cue, Schilling was saying he makes with his young pitchers is to not get the arm involved too early. Don't start throwing too early. Let your body get down the mound. With a lot of pitchers, their leg will swing out, or they'll break their hands too early and all of this unneeded swinging and movement is happening. I think of Price as a compact movement, and his arm doesn't get involved too early or have to do too much. In relation to my lower half cue post, force into the ground will help rotation, and in turn the arm speed will be there. It all connects.
Here's Price, notice how nothing works too hard, and how the arm gets involved when it needs to: