LOS ANGELES — When he arrived in Giants camp this spring, Eric Haase already had caught for three other big league organizations. He learned to play left field along the way and even got some reps at first base. He became familiar with the rhythm of a backup catcher, and learned to accept what that means when you’re 33 and hoping to stick around the big leagues.For players with Haase’s profile, there’s generally a familiar path at this point. You look for starts and opportunities where you can, even if that means a return to Triple-A. Perhaps you start to think about life as a manager. Or life in the broadcast booth. The position is a pipeline for both professions. That was what was hanging over Haase when he arrived. What was in front of him was a brick wall.The Giants had a Gold Glove-winning catcher in Patrick Bailey and a pair of talented 24-year-old backup options in Daniel Susac and Jesús Rodríguez. On performance alone, Haase was neck and neck with Susac all spring. But Susac is a decade younger and a Rule 5 pick. It was never really much of a competition. When Susac officially was chosen, Haase took an opt-out in...