Looking at Sean Smith's TotalZone fielding metric and applying it to the top third base prospects in baseball.
MOORE: … It is hard for hitters to develop beyond their level of competition. It is easier for pitchers to improve their game in some ways, a 90 MPH fastball is a 90 MPH fastball. But a hitter, he gets used to facing whatever pitchers he’s facing, he gets grooved to facing that. You can’t learn to hit against pitchers with plus velocity or great breaking stuff unless you see them.