It'll be up in the air all season.
If Kepler hits, at least RH pitching, and Marsh can hit RH pitching, Crawford LH hitter, may depend on Rojas, whether his winter ball performance shows improvement. Wilson in LF, Castellanos in RF against LH pitching.
I can see Castellanos becoming a platoon OF b/c his hitting against RH isn't good enough to compensate for his fielding.
Last three seasons, against RH pitchers, 93, 94, 98 RC+. Given his fielding that's below replacement - better off playing Rojas, 106, 77 RC+ against RH pitching last two seasons.
Meanwhile, against LH pitchers, 100, 149, 125.