The Spurs probably sensed something is not going right for them, especially after the Pau Gasol, Shaquille O'Neal, and Jason Kidd trades. They made some minor moves of their own to make their line-up a lot deeper.
First was signing point guard Damon Stoudamire, and lately, sending guard Brent Barry and center Francisco Elson to Seattle for Kurt Thomas. Though such trades are not as big, it will definitely make some noise in the West.
But the Spurs better pile up titles fast, they're not getting any younger.