Because the Marlins’ spring training clubhouse is not large enough to accommodate everyone, a bank of temporary lockers sits in the middle of the room to handle the overflow. Call it the island of promise. Call it the stockpile of possibility. Call it the one silver lining — if you’re a Marlins fan — in the twisted wreckage of an offseason that saw the roster turned to rubble by a giant sledgehammer. “It’s pretty special,” beams Marty Scott, the Marlins’ vice president of player development. “The general public was upset in the fall when we gave away some of our big-name guys. But, from my standpoint … .” From Scott’s standpoint, it’s a blessing. The name tags above the lockers in the middle represent one of the top stables of young talent in the majors, a building block the Marlins are counting on to put the organization back on the winning track. Jose Fernandez, perhaps the top homegrown pitching phenom the Marlins have had since Josh Beckett, sits there. So does outfielder Christian Yelich, whose swing, scouts say, is as silky as they come.