When Rincon was obviously blowing up in the 8th, he had no place else to turn. He'd already used his only other reliable guy. He was out of options. If he'd have had Balfour, he might have gone to him when it was becoming obvious that Rincon was s***ing the bed. Did the move cost him the game? Neither you nor I know how it would have turned out if he had kept Santana in the game, but it was a terribly wrong and stupid move.