This seems like a strange thing to say about a player who put up a 122 wRC+ last season. Or a player who ranks 5th in that category at his position (minimum 100 PAs). And especially about a player who walked 11.8% of the time and slashed .275/.366/.429.
Then, you look at those four seasons in rookie ball. You see seven total seasons in the minor leagues and a player who had climbed only as high as High-A. Born in Maracay, Venezuela (hometown of several major league players, including Jose Altuve and former Mariner Carlos Guillen), he signed with the Tampa Bay Rays organization at age 16.