Since taking over as the Giants president of baseball operations, Buster Posey has been pushing to bring back a winning culture in San Francisco.With his championship pedigree, Giants fans seem to have a high level of trust toward Posey and his decision-making in the front office.Meanwhile, Giants chairman Greg Johnson has other reasons for believing in the seven-time All-Star catcher.“I’ve said this before, Buster is the only guy in his 30s where I feel like I’m the young guy with him sometimes,” Johnson told the San Francisco Chronicle on Thursday. “He’s thoughtful and just carries himself so well.“I think the other thing he’s trying to do is build a team of competitors, gritty guys. And I think he’s done that with [Harrison] Bader and some of these guys who fit the bill. [Willy] Adames was such a great add, he just pulls guys together.”In his tenure so far, Posey has attracted several notable players, such as shortstop Willy Adames and, more recently, outfielder Harrison Bader and infielder Luis Arráez, to San Francisco.This offseason, Posey and the Giants’ front office also...