PHOENIX –– Last year, Dalton Rushing felt like he was playing on “thin ice.” As a rookie back-up catcher with the juggernaut Dodgers , he spent most of his debut season almost walking on eggshells. Maybe on another team, or in a less star-studded clubhouse , his big-league introduction would’ve felt different. In many organizations, his arrival as a top-ranked, power-hitting catching prospect would have been a very big deal. But with the Dodgers, the former first-round draft pick got a reality