If I remember correctly, there have been other Twins prospects that improved their batting skills as they faced better pitching. The more reliable the pitcher is, the easier it is for some batters to hit. This is especially true for players with a talent for selective hitting. When the computer is calling balls and strikes, Sabato could excel.
Although Sabato seems like an odd choice for a first pitch, perhaps he was hands down the best player available at the time. Besides, what's wrong with drafting someone to use as trade bait?