My best guess is that Harper plays half the season at AA, and half at AAA. Maybe a call-up in September, but major league pitching is a long jump from AA.
Incidentally, as per Ladson:
- Al Kaline was not "drafted" in 1953. He was signed as a bonus baby, just like Harmon Killebrew and Jerry Schoonmaker. The bonus rule said that a team had to keep a player on their major league roster for about three seasons before letting them play in the minors. It was an attempt to keep teams like the Yankees from buying up all the high school talent -- all the Mickey Mantles.
- Of all the young players to pick, Kaline makes Ladson's argument most wobbly. Al Kaline, who was a first-ballot Hall of Famer, hit about .275 in 1954, his first full season. In 1955, he hit .340. If that's the dismal fate Ladson is predicting for Harper, I'll take it.
- Incidentally, pitching in 1953 was probably tougher than today, comparatively. There were only eight teams in each league, and MLB was far and away the leading professional sport. The NFL had a small following, and the NBA was more related to the circus sideshow than to sports. (That's not entirely a joke. The NBA was formed by guys who owned the arenas, who wanted something to show when the circus was not in town.) If you were an athlete, you played baseball.