At Boise State, where Jeanty was the Heisman Trophy runner-up last season and averaged 7.0 yards per carry, he had the most upright backfield stance you'll see for a running back. Before snaps, Jeanty had no knee bend and let his arms hang down near his sides.

Ashton Jeanty didn’t have the NFL debut he was hoping for. The rookie running back, whom the Raiders selected sixth overall out of Boise State, rushed three times for minus-one yards in Thursday’s preseason opener against the Seahawks, causing fans to share early concerns about his outlook.