Puig's advantage over Fernandez for ROY

ESPN's Buster Olney says today that Miami Marlins' ace Jose Fernandez is the favorite for National League Rookie of the Year, basing that on both Fernandez's numbers (10-5, 2.30 ERA) and convincing words from from a major league scout, but he adds that there is one factor that could sway the vote to someone else like Yasiel Puig.