The Oakland Raiders continue to form their offensive attack heading into the 2015 season. While Derek Carr headlines the group with Amari Cooper and Latavius Murray as guaranteed starters, there are still questions about the ranking of depth behind the playmakers. The biggest battle could be at the running back position as Trent Richardson is looking to make the team while Roy Helo and Michael Dyer continue to make a better impression.

Richardson is at risk of not making the final roster for the Raiders as the running back continues to get shown up by other players on the roster. After a lackluster performance in his first preseason game, Richardson did very little to turn things around while Dyer's stock keeps rising. According to SFGate.com, Dyer is the favorite to land the backup position with the Raiders as he put up 45 yards on 12 carries in the second preseason game.

"Felt pretty good," Dyer said, via SFGate.com. "First game getting a bunch of carries and feeling like part of the team. I am just trying to find a role, so for me it was a great day. I was able to get in a rhythm."

Murray is the clear starter for the Raiders as he continues to handle the rushing load with the first-team offense. Richardson is the player with the most at stake this preseason. The running back was unfairly clowned on social media for missing a huge hole in the offensive line in the team's first preseason game while adding just five yards in the second game. There is a slim chance that the Raiders enter the season with four running backs meaning he could be out.

Meanwhile, Cooper continues to show why he was a Heisman candidate and first-round pick. The receiver and Carr are quickly building plenty of chemistry while Michael Crabtree is a nice compliment on the other side of the field. With Andre Holmes injured, there is a chance for other players to step up and be seen. Rod Streater and Brice Butler have a lot to prove along with Mychal Rivera who is falling out of favor as the starting tight end with the rise of Clive Walford. Head coach Jack Del Rio is loving the battles on offense as he remains confident the Raiders could be very explosive with the amount of depth built up.