Denver's fallback plan on the O-line

Some have installed the Seattle Seahawks or the San Francisco 49ers as their offseason Super Bowl favorites, while others like the chances of the Denver Broncos, seeing as they had the AFC's best record in 2012 and have added some key pieces. But they do have a pretty big issue on their offensive line: namely, two of the five starters have not been present for any of the offseason work on the field yet.