Tim Duncan retired. It's kind of the end of an era for the Spurs. Strange to say it, but essentially the Spurs are sort of officially in a rebuild phase. Yes, we still have Tony and Manu (albeit on the last legs of their careers), yes we did sign Pau (also last legs), but Timmy was the cornerstone for the franchise for arguably his entire 19 year career. Yet this is what makes the Spurs amazing. For most NBA teams the word "rebuilding" means that you're bottom feeding in the standings, looking for that lottery pick that will change your fortunes (e.g. the 76ers). It's interesting to note, that no team with a top five pick has jumped from lottery to the playoffs since 2003, no rookie has had that sort of impact since Carmelo Anthony and Dwyane Wade (not gonna count Darko even though he technically won a championship his rookie year, because frankly, Larry Brown hated playing rookies). Currently, as stars of the early 2000s (e.g. Duncan, Kobe Bryant, and Dirk Nowitzki, sorry but Kevin Garnett hasn't really been super relevant for the better part of the last decade) begin to fade into the sunset most teams are either rebuilding (e.g. the Lakers now that Kobe is gone) or anticipating a rebuild (e.g. the Mavericks once Dirk is gone). That's what happens when you lose a pillar of the team.