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Willis McGahee is an 11-year veteran who is under contract for 2013, but Knowshon Moreno, who took over the running back position when McGahee suffered an injury in Week 11, is also under contract. McGahee was the starting running back until his season-ending injury, but he was having trouble with ball security until that point, with five fumbles.
After McGahee's injury, Moreno took over and the running back position never missed a beat. Moreno has over 500 yards and four touchdowns. He also has only one fumble.
Age is also an issue. Moreno is only 25, whereas McGahee is 31 and has suffered from knee and leg injuries over the past few years.
If Denver is looking for a running back of the future, Moreno may be the way to go. He has effectively taken over the running back position in McGahee's absence and has proven he could have a bright future with the Denver Broncos. If I were John Fox, he'd be my starting running back in 2013.