I liked the Thunder's defensive game plan against the Warriors up until the last eight or so minutes. They treated Green as a wing instead of a big and guarded him accordingly. At the same time, they also treated Barnes/Livingston as bigs. If the Spurs still have 2012 Jack, he'd be perfect for this series. Anderson is probably the best they could do.
The advantage GS has from having a wing on Green is that Draymond can back them down. But that won't really work against Kawhi, Green or Anderson. The first one is obvious, but the second two are the guys who will only struggle if the whistle is against them. They're both great at stealing the ball from the poster. GS is great at this as a team, but they rely on the refs to let them hack at times. If the game is called evenly, it should mean that Green is neutralized as a scorer in exchange for LMA not doing much posting up Green.
So the only thing you really have to do in relation to Curry is not let Green get the ball. If he's the screener, switch (which would be easy if you have Leonard or Anderson on him). If Bogut or Barnes is is the screener, you hedge and let those guys beat you from inside the arc. The most important thing is that you don't give secondary help. If Bogut gets the ball at the elbow, you let him make his move. You don't have someone sink off Thompson to help.
In fact, besides the hedging scenario, the Spurs should NEVER help off Thompson or Barnes. Let the dunks happen; let the layups happen. Trust that your perimeter defenders can stay in or get back into the play. Don't give them an opportunity to get into a rhythm of passing the ball. It's clear from Green's outburst that there are some fragile egos in that locker room. Not letting Draymond touch the ball meaningfully or making Curry use all the possessions on two-pointers will wear on them psychologically.