Last May, the Yankees bullpen was forced to adjust. Mariano Rivera’s injury forced a premature glimpse into an inevitable future, and the Yankees filled the void with a veteran who’s since left for Washington. Now Rivera is back, but he’s brought only a sense of temporary security. Much like the rotation, the Yankees bullpen has been filled by a capable and potentially strong group of pitchers, but that group has left significant uncertainty for 2014 and beyond. There are young relievers on the rise, and the Yankees might have jobs for them in the not-so-distant future.