Coach Steve Kerr leads Warriors to NBA championshipCLEVELAND — As Warriors head coach Steve Kerr sat on Tuesday's postgame dais, beaming with joy about the franchise's first championship in 40 years, he tried to explain how it all came to pass.Kerr is the first rookie coach to win a championship since the Lakers' Pat Riley in 1982, and he led a team without any previous Finals experience to a title for the first time since the 1991 Chicago Bulls.Bob Myers (the Warriors' general manager) and his staff have done an incredible job of putting together this roster.Having won five titles as a player with the Bulls and Spurs, Kerr was given immediate respect.Having traveled to their homes and talked to the players about their families and lives before ever discussing basketball, he earned their hearts.Kerr praised the medical staff and plain, old, dumb luck.[...] none of it matters.