Astros general manager Jeff Luhnow and the organization’s staff of decision scientists aren’t the only ones who subscribe to the power of advanced statistics. Since spring training, first-year manager Bo Porter has randomly offered hints he’s a believer in the modern version of baseball, which is still defined by effort, execution and on-the-field production, but increasingly supported by metrics and analysis. Saturday, Porter took his belief a step further. “Batting average to me is the most overrated statistic in baseball,” said Porter, prior to a game against the Athletics at Minute Maid Park. Like most players, Porter barely paid attention to advanced stats when he roamed the field. But since [...]