I remember a time when Pop made decisions primarily based on defense (98'-05'). As a result, these teams tended to overachieve with this philosophy being the primary staple. Leading them to three les by 2005.
Unfortunately, something died the following season....
The part of Pop's brain that prioritized defense.
Unfortunately for the Spurs and their fans, Pop has never recovered. He's made some pretty questionable decisions pretty much every playoff run besides 2007.
*Just a friendly reminder: 07' was a year when the league was really watered down (compared to 08'-now; and before that Pistons (03'-05')-Lakers (99'-04') were very formidable and comparable to the elite teams today). The only viable threat in 2007 got kicked out of the 1st round. Which was partially why the Spurs were able to get a ring with an untalented roster.
Moving on...
Here's some year to year evidence of Pop's brain steadily decaying.
2006- Small-ball vs. Dallas- Big piece of the 05' ship sat to rot on the bench (Nazr)- Defense and rebound suffered because of it. As we all know, defense and rebounding was a huge staple in the 99',03' and 05' championship le runs. Ultimately, Spurs weren't able to beat or stop the Mavs. Even though I believe they would have in 6 games had Nazr been a part of it.
2007- Spurs won a championship in one of the most watered down NBA seasons of the past 20 years. This championship season lead to the front office becoming wrongfully content on bringing back the same over-achieving team instead of trying to build on the 07' team talent-wise. (IIRC- I believe they signed Vaughn and Bonner to extensions in the first week of free agency and carelessly used Scola's rights to get rid of the carcass of Jackie Butler.)
2008- Spurs grind their way to the WCF vs. Lakers- Pop elects to sit Bowen more than usual. At the same time, Pop matches Odom with Udoka and puts Finley at SF to try to enhance the offensive output. Even though Odom lived on the offensive glass, Pop continued to go small. All while sitting their best perimeter defender (Bowen) and post defender (Kurt Thomas) majority of the series. Spurs defense then goes to and Spurs get abused on the boards just like 2006. Spurs lose again.
2009- True hangover from the mistaken 2007 off-season- Very untalented team that had no real championship aspirations. Pop still couldn't get away from shooting his own team in the foot by playing Vaughn, Finley and Bonner over Hill, Bowen and Thomas/Gooden. Do I need to explain how Bowen, Hill and Thomas could have been better options than Vaughn, Finley and Bonner? I think not.
2010- Pop elects to not give Hairston or Temple a chance to build on their success in the regular season. And no I'm not talking about 2011 Garrett Temple, Temple in 2010 was very productive; Hairston as well (especially on the glass and the defensive end). Pop elected to stick with the atrocious play of Mason and Bogans hoping for the "law of averages" theory to materialize. It never did. That decision ended up burning the Spurs in the end, Spurs had no bench because of it. Had Pop given Hairston and Temple a real opportunity to build on their regular season success later in the year, they would have been ready to contribute come playoff time when Mason and Bogans continued to suck. At the same time, Bonner-ball was still a staple in Pop's offensive minded philosophy and Spurs lost once again.
2011- Splitters situation ( I don't think I need to explain). Overplaying the out of Bonner when it matters most.
So if you can count, that's five out of the last six years where Pop made very questionable decisions. In my opinion and likely many others, he shot his own team in the foot in each of these five years.