Dolphins RB Reggie Bush is up for a new contract and Miami could let the rusher go, according to Kareem Copeland.

Bush carried the ball 219 times for 960 yards and six touchdowns in 2012, failing to eclipse 1,000 yards and averaging a ho-hum 4.4 yards per carry.

The Dolphins stand to have a lot of cap space to play with this offseason, but also need to re-up players like Sean Smith, Jake Long and Brian Hartline.

Behind Bush, the Dolphins have fresh-faced rookie Lamar Miller, a University of Miami product whom the team drafted in 2012.

Miller carried the ball 46 times for 237 yards this season, adding a touchdown. He has real speed, too, having run a 4.4 second 40-yard dash at the scouting combine last year.

The rusher has good chemistry with quarterback Ryan Tannehill and can handle an increased workload. Miller has succeeded in the team’s zone-blocking scheme, averaging 5.2 yards per carry at a fraction of Bush’s cost.

There’s no reason to think Miller can’t take on Bush’s carries and become a feature back in the league. He’s efficient in both dollars and yards per carry.

If Miami proceeds with Miller as their starter, the team can focus some of Bush’s money on upgrading the wide receiver position, a unit that has hurt the Dolphins this season.

Should the Dolphins let Bush go, the team could stand to offer Packers WR Greg Jennings a nice package to re-unite with Joe Philbin and be a bonafide No. 1 receiver on an up and coming team in a hot area.