If it doesn’t work due to the D countering it or a key injury he has no Plan-B and isn’t very good at thinking on his feet.
This was entire problem as the Offensive Coordinator in Super Bowl LI. If Shanahan had called a slightly more conservative offense in the secnod half, had more running plays and high percentage passes, the Pats probably wouldn’t have been able to complete their comeback. But he had to stay in downfield attack mode, which had a a higher chance of turnovers and penalties, and ultimately resulted in a few short drives.
This was entire problem as the Offensive Coordinator in Super Bowl LI. If Shanahan had called a slightly more conservative offense in the secnod half, had more running plays and high percentage passes, the Pats probably wouldn’t have been able to complete their comeback. But he had to stay in downfield attack mode, which had a a higher chance of turnovers and penalties, and ultimately resulted in a few short drives.