Jose Ferrer’s first save with the Mariners should be the headline, but it should not be the whole story. Ferrer closed out Seattle’s 3-1 win over the Braves on Wednesday, giving the Mariners exactly the kind of late-inning answer they hoped they were getting when they traded for him. The save was big. But the more convincing part was not just that Ferrer finished one game. It was that he spent the entire series quietly proving he could be trusted. The more interesting part is what happened before Ferrer jogged in to finish off Atlanta on May 6. The Mariners got three straight appearances against the same dangerous Braves lineup, with almost nothing leaking through. Ferrer appeared on May 4 and gave Seattle 1 1/3  scoreless innings, allowing one hit, walking nobody and striking out one. He came back the next day and threw a clean inning with two strikeouts. Then, in the finale, he handled the ninth, picked up the save, and finished another scoreless inning with one more strikeout.…