"We" can't keep going to Duncan, but "we" can keep putting the ball in the hands of Ginobili, who's not only playing the worst of the big three, but has the least advantageous match-up of the three? That makes a lot of sense. Ginobili is right back to being his old, inconsistent self. If the Spurs are going to go down in this series, then they should go down going to their most advantageous matchups most. Did Duncan struggle in the post at times? Sure. It's probably because he's not used to getting the damn ball down there, since it hasn't made it's way down there in about a half a season.
It's going to be all for naught, though. I hate to say it because I picked the Spurs in six, but they can't defend this team and it's clear Pop has no idea what he wants to do rotation-wise, but it is clear that we'll see plenty of small ball. What that means is you can forget about pounding them on the boards. So you can't keep pace with them offensively, can't slow them defensively and can't dominate the boards. How do you expect to win? Maybe Ginobili can shoot 15 threes and throw the ball away 10 times next game off of cross body pick-and-roll passes. That will get it done.