I've watched both Harmon Killebrew and Daryl Strawberry. Harper is closer to Killebrew, although:
- Harper is 21; Killer established himself at 23
- Killebrew was stuck on the Nats bench at 17 - 19 or 20, stuck by the Bonus Baby rules. Harper has had much more coaching than Killebrew got.
- However, Killebrew is in the Hall of Fame. Harper might turn out to be very good, but not all-time great. We don't now yet.
- Strawberry had all the "tools" and massive hype, but he was not a good ballplayer. That was a big argument in all the New York press: every year, we read that "he's young...just wait". Strawberry never learned when to steal a base or when to hit the cutoff man. His swing, on breaking stuff, was as wild as Espinosa's.
- Harper is already useful. If he keeps improving, he'll be fine. He doesn't have to be Johnny Bench, Mickey Mantle, and Ty Cobb all rolled together.