Perhaps we have short memories, or perhaps I'm wrong, but 2003 was Pop's best work in a championship year.
Consider this: Popovich played most of the year with this roster:
Robinson/Willis
Duncan/Rose
Bowen/Ferry
Jackson/Ginobili/Smith
Parker/Claxton/Kerr
The guys in bold were all at least 36 years old when the season started except for Steve Smith, who at 33 years old could barely even move anymore - 40 year old Kevin Willis was moving much better than Smith. The guys in underlined text were 25 or younger, with very little NBA experience to go with their age. Parker had a great rookie season in 2001-02, but Claxton was coming off an undistinguished rookie season which took place a season after he was drafted due to injury. Stephen Jackson had played in only 100 games during his first two NBA seasons, and Italian League star Manu Ginobili was a 25 year old rookie.
Only three players on that roster were in their primes - starters Tim Duncan (the reigning MVP) and Bruce Bowen (the defensive stopper), along with Malik Rose, the 6th man.
On January 1st, 2003, the Spurs were 19-13 through the first 50 games of the season. They finished the season 41-9, tying Dallas for the best record in basketball at 60-22.
Forty-one and freaking nine. With that roster.
Imagine taking down a three-peat championship club with Tim Duncan, Bruce Bowen, a bunch of kids, and a bunch of geezers. How many coaches would have managed to dethrone the Lakers with a cast like that?