I also agree with PG. TL (as most pitchers) was drafted for his fastball, his off speed compliments that.
In HS, son's best pitch was his change up, he too threw them for first pitch strikes, you can do that on that level, you can't as you move up. I agree, most mlb will tell you they dread the slider the most.
The biggest gambler on the mound was Maddox, whose father was a dealer in LV and he based his game largly on numerical odds. He also studied every batter he faced personally, knew every weakness they had.
Spiz,
Erik Manning is a friend of mine, who just began writing for fangraphs, and he will be pleased to know his article sparked debate. He lives in the Cedar Rapids area, I keep telling him to contact PG. He writes some great stuff.