I don’t suspect he will be another JBJ, who took over 700 MLB plate appearances before he started to hit MLB pitching. But in the meantime, if he does contribute with game-changing defense, that’s absolutely a startable skill, and one that, as a CF, can be a bigger factor in a game than whatever he does in 4 plate appearances.
But in a year where the Sox are making minimal effort to compete, holding him back for an extra season of control certainly has merit.
But the Sox are not really loaded with OF talent right now. If Rafaela is in Worcester for April and May, does that mean O’Neill-Duran-Abreu is the starting OF in April?