The Diamondbacks’ signing of Gregor Blanco earlier this week makes some sense, when viewed in the consensus light of the team’s situation. He offers a left-handed fourth outfielder, who can back up the expected everyday starting trio of David Peralta, A.J. Pollock and Yasmany Tomas. But the team’s apparent interest in Michael Saunders, as Tweeted by Jerry Crasnick, is rather harder to understand in the same way. Of course, it’s hard to be sure about the level of Arizona interest. And Saunders is another left-handed outfield bat, so at first glance, it could seem a case of the team kicking one set of tires, then moving on to another option.