This is all that matters, it's what they need to focus on. They will not flat out stop the Thunder, especially at home. They can score pretty damn well. And they're great on defense, so you really need to take care of the ball.
What's most frustrating to me is this is the area in which the Spurs should be exploiting their advantage on, being older and more experienced, especially in playoff basketball. They obviously know they can't hang with the Thunder athletically, they need all the shots they can get, and that means few turnovers.