#1: Ibaka and collison have been as bad as perkins. it's not that simple
#2: You do that they play splitter and TD, or Diaw and TD.
#3: Should be a general rule, but it's not how they got here.
#4: Cook is more of a gamble than sefelosha or fisher.
#1 Ibaka and Collison can at least play the PnR defense decent enough. Perkins is a lost cause and bleeding their perimeter defense.
#2 Durant would be in the 4 spot. So TD, Diaw, or Splitter is going to guard him on the perimeter? This is a gamble, but force the Spurs to match up.
#3 Playoffs are a different animal. Cutting the rotation to 8 guys is common and keep 2 of the Big 3 should be part of the game plan.
#4 This is a prayer. Fisher and Sefelosha are huge liabilities on offense. Cook could boost their perimeter shooting.
If the Thunder keep their lineup and rotations, there are only 2 ways they can win a game. Offensive rebounding and FThunder. With no post-up game, they don't have much to rely upon in the half-court against the Spurs. The bigs can't shoot and the rest of the players are forced into tough shots in the lane or contested jumpers.
First, they need to stop the Spurs from scoring so easily in the halfcourt off PnR. A switching defense can stifle movement in the half court. Then a small lineup can run the ball off misses which is their strength.