Carroll didn't have to really "coach" at USC. He had such good players, they could make plays regardless of what was called. Until they got into a tight spot and didn't make the play.
If Lendale White gains 2 yards instead of 1, the Trojans win the Rose Bowl and the national championship. Wrong call, wrong personnel in the game, White ran to the wrong hole. But those things didn't usually matter. A superior Trojans team could do a lot of things wrong and still gain the 2 yards ... until they didn't.
Carroll had superior personnel in Seattle, too. If Wilson's pass is complete for a touchdown, the Seahawks win the Super Bowl. Wrong call, wrong play, throwing the ball to the wrong person instead of handing it to the right person. etc. etc. etc.