James Cook and ball security: How worried should Buffalo Bills be?

Picture this, Buffalo Bills fans: the team has an elite running back. That player averages over 5.5 yards per touch. He's become one of the main focal points of the offense. He's a threat to score a touchdown every time he touches the football. He can gain tough yards between the tackles, but he also has the breakaway speed necessary to create explosive plays on the ground. The only issue? He fumbles—a lot. In fact, he fumbles once every 50 times he touches the football, which is well above the league average. Should the Bills be nervous?