None of this should have mattered. Not in the middle of February. Not with a college kid on the mound. Not with so little, really, on the line. But Blake Swihart hit a booming fly ball Thursday, and he might have been the only guy on the field who really needed it. The center fielder never came close to catching it, and as the ball bounced into the triangle, Swihart sprinted around second base without slowing down. He slid feet-first for an RBI triple that will never again show up in his statistics. It shouldn’t have mattered, not one little bit, but you wouldn’t know it from the way Swihart talked. “See my smile?” he said. “It feels good.” No player on the bubble makes the team with one good game, and no spring training base hit erases two years of injury and disappointment, but Swihart defies convention. At least, at this point he does. Once one of the most highly touted prospects in the game, he’s now he’s fighting for the 25th spot on the roster, and he has no clear role to play if he makes it. But the Red Sox are putting time and effort into customizing his workout schedule to maximize opportunity.