PHOENIX — Greg Johnson is the San Francisco Giants’ chairman and principal investor. Buster Posey is the club’s president of baseball operations and sits on the ownership group’s executive board.Nolan Arenado does not own a piece of the Giants. It only seems that way. This season, when the team plays Arenado’s Arizona Diamondbacks, there’s no question who’s boss.The Giants’ 5-4 loss to Arizona at Chase Field on Monday night followed a familiar pattern amid a season of loose threads and unforced errors. A mental mistake on the basepaths that brought a rally to a premature end? Check. A jumbo inning for the opposition fueled by a pair of walks? Check. A confusing situation — right-hander Tyler Mahle being surprised to learn he was on an 85-pitch limit — that could have been remedied by clearer communication between the coaching staff and players? That too.What made Monday night’s loss most familiar, of course, is that it came against the Diamondbacks, who improved to 7-0 against the Giants this season. It’s the first time Arizona has begun a season with seven consecutive victories against an opponent. It also marks the first time the Giants are 0-7 against an opponent since 2010 when they dropped their first seven games against the San Diego Padres.If you have even a casual grasp of Giants history, you know that things turned out OK against the Padres at the end of that season. But these Giants are not those Giants. The 2010 team was packed with self-made players. This group is more about the self-own.