Spurs is a much much older team than Thunder, no other coach in the history of this league would be able to get the current GDP core 2-0 into the western conference finals and 28 seconds away from a le last year.
Think about what Hakeem/Shaq/Jordan were doing at age 38, they sure as weren't competing in the final rounds of playoffs.
Spurs fans are so incredibly spoiled. Only reason the team was/is a contender is because of Popovich's minute management of GDP. There is only so much you can do when Duncan is no longer capable of soloing Perkins/Adams of the world.
Anything GDP gives at this point is a gift, just enjoy the final moments of this core before this team sinks to the bottom half of the league for the next decade when Popovich retires.