For a full year, Steve Kerr told himself that 12 years as head coach of the Warriors might be enough.For the past few weeks, Kerr wondered if he wanted more but couldn’t shake the thought that 12 years probably would be enough.Kerr over the past few days decided he wanted more. And on Saturday, after all conditions were satisfied, agreed to two-year contract with the Warriors. The deal was first reported by ESPN and confirmed by NBC Sports Bay Area.Why would a 60-year-old basketball coach want more after earning roughly $100 million and winning four championship rings with Golden State that guarantees enshrinement in the Hall of Fame?There are several reasons, including Kerr’s passion for the game, but his decision to return is inextricably linked to his 12-year collaboration with Stephen Curry. If Curry had announced his retirement on Friday, it’s likely that Kerr would have followed him out the door.“I will never leave Steph Curry,” Kerr told Zena Keita on The Athletic Show last December.Five months later, while addressing his future with the Warriors after the team’s season-ending loss in the NBA play-in tournament, Kerr cited...