This idea that the Mets rookie shortstop should learn to play center-field for 2019, much less bat leadoff with a current OBP of .274 is just ridiculous. This off-season, Rosarion should just be assigned to work on his defense and get a better appreciation of the strike zone. The kid has a load of talent, it just needs to be fine-tuned. Adding to his struggles or messing with his head to learn a new position and/or fulfill the needs of a high-pressure spot such as batting leadoff is just, at this time, unnecessary and asking for trouble. Leave the kid alone.