Davey Johnson held court. He toyed with reporters inside the Washington Nationals’ dugout Tuesday morning like only a 70-year-old manager can, then reveled in the wonders of modern baseball, which stretch the game from Florida spring training to the Far East. Bo Porter ran his own show. Always switched to “on” and forever proud, the Astros’ first-year manager was dually boastful and modest. Porter, 40, stuck up for a young club few expect much of in 2013. Then he reminded the media his daily work is as spiritual as it is professional. On the same field, walking on the same grass and within the same lines, was the man who could’ve been Porter: Tony DeFrancesco, a minor league lifer who spent eight seasons as a catcher jumping between Class A and AAA, then traded his hardware for an ongoing 19-year run as a manager. This season, the 49-year-old DeFrancesco will guide the Oklahoma City Redhawks, the Astros’ Class AAA affiliate. But until March 28 he’s still an Astro, serving as a spring training coach and traveling with the big league club for road contests, wrapped within the daily operations and evolution of a team he led for 41 better-than-expected games last season as an interim major league manager.