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Across his minor league career, the 35-year-old catcher has slashed an underwhelming .262/.301/.373. He hasn’t done much better in winter league ball, and his short stints in the majors have failed to make an impression. While coaches have praised his receiving skills and ability to work with young pitchers, it hasn’t been enough to secure a backup role at the MLB level. Look up organizational filler in a dictionary, and you’ll find a picture of Castillo staring right back at you.