What are the implications of a federal court's interpretation and application of the U.S. Sentencing Guidelines for Bank Robbery?

Wills contends that the court inappropriately enhanced his sentence by two levels for his role in the offense. He argues that the Government offered no evidence at trial to demonstrate that he was "anything other than a participant" in the bank robbery. "We review the district court's interpretation and application of the United States Sentencing Guidelines ("U.S.S.G.") de novo, while we review the district court's factual findings in the sentencing phase for clear error." United States v. Oliver, 60 F.3d 547, 554 (9th Cir.1995).