You honestly believe there are 3 other team's better than the spurs? Warriors are obvious favorites, but still Depends on chemistry and how long that takes. Their bench is nothing compared to what it was. Clippers are older and have both star players coming off of Injuries and have never really had a consistent Bench. Spurs starting 5 is better. Thunder lost a top 5 player and a very good rotational big in ibaka. He's a starter, but it kills their rotation. No-one that caliber will be coming off their bench.
Who is going to outplay the spurs with three legitimate all stars? Like pau or not, he has always been a beast on the offensive end and consistent defensively even if people make up bad defense narratives. Almost ALL bigs are at a disadvantage away from basket. Couple might be able to make a play here and there. Kawhi will be better, lma wil be better now that he knows the system. Danny will be Better, he got his confidence back in the playoffs. Parker hopefully won't be as fat.
Spurs are looking good in the west. They upgraded their bigs across the board besides back up pf, which Anderson is likely to play. Mills will be healthier. Manu says he's healthier than he has been in couple years.
Really no reason to believe a big drop off is coming in the form of "rebuilding."
They are contending.