KANSAS CITY, Mo. – There isn't much that rattles David Johnson, as a smile seems permanently attached to his face.

The Cardinals' star running back admits, though, that the first seven games of the season weren't easy. Johnson's touches were less than ideal during that stretch, and when he was getting the ball, it often wasn't in space.

The promotion of Byron Leftwich to offensive coordinator has seemingly fixed that. Johnson totaled 100 yards from scrimmage in Leftwich's debut last time out against the 49ers, and was even better in Sunday's 26-14 loss to the Chiefs.

Johnson finished with a season-high 98 rushing yards on 21 carries and had seven catches for 85 yards, also season bests. He had both of the team's touchdowns in the contest.

"The first eight weeks were tough, trying to get used to a new type of offense," Johnson said. "It was tough, but the biggest thing is I'm glad we're coming back to the old ways."

Leftwich's goal upon moving into the playcaller role was to deploy Johnson like he was used in 2016, when Johnson nearly became the third player in NFL history to finish with 1,000 rushing yards and 1,000 receiving yards in a season.