After landing their main target, the Spurs still need to round out their roster and don't have a lot of tools at their disposal to do so.
The Spurs, for the first time in the Duncan era and maybe ever, got a premier free agent. LaMarcus Aldridge will play in San Antonio for the next four years, validating the moves the front office made to put the franchise in the position to make it happen.
The signing raises the talent level on the roster significantly and puts the team in a great place to face the post-Duncan era, whenever it may come.