When the Red Sox added Sonny Gray and Ranger Suarez, there was no question how they’d fit into the club’s plans. Boston’s other rotation addition doesn’t have as obvious a fit, but he could still prove a huge presence. Standing at 6-foot-6, 275 pounds, Johan Oviedo is a mountain of a right-hander who stands as one of the biggest wild cards on the Red Sox roster. Red Sox pitching coach Andrew Bailey described Oviedo as possessing “elite stuff” and as someone with both a high floor and an even higher ceiling. Here is all about winning, World Series is the main thing that comes to mind when I hear the name Red Sox,” Oviedo said at Fenway Fest.