Jose Quintana.
Just kidding (unfortunately). Actually, Starling Marte will offset a slight dip in OBP (driven by a conscious effort to try to steer clear of a few HBP balls) by putting up slightly higher power numbers (more doubles and dingers).
And he will also assume the more-difficult CF duties and play nearly-flawlessy for the entire (healthy) season, putting up somewhere between 5.5 - 6.5 WAR and landing not just Pirate MVP, but also landing somewhere in the conversation for NL MVP.