In a league built for parity, San Antonio has reached the playoffs in 20 straight seasons and won five NBA titles since 1999. Now, with the All-Star break only a week away, the Spurs lurk on the fringes of the discussion over which teams — Boston, Houston or Cleveland? — are the Warriors' biggest championship threat. That San Antonio has weathered the extended absence of Kawhi Leonard to sit third in the Western Conference standings doesn't surprise Golden State head coach Steve Kerr. In his four seasons as a reserve guard with the Spurs (1999-2001, 2002-03), Kerr came to understand that the institutional culture head coach Gregg Popovich has fostered trumps roster flaws or injuries.