‘Denver giving backup running backs Correll Buckhalter and J.J. Arrington four-year deals that average more than $2 million a season has set a negotiating bar for Jackson. He feels strongly enough in his case that he has chosen to stay away from the team’s voluntary offseason workout program. Jackson averaged 5.2 yards a carry in 2007 and 4.4 in 2008, numbers that better those of Lynch.’