NFL free agency begins on March 11, kicking off a spending spree the Ravens aren't likely to be a major part of. They are more likely to focus on keeping some of their own free agents, a task they have already started to take on. But they won't be able to keep all of them. So who should be the priority? In this week's Five for Friday, Baltimore Sun blogger and reporter Matt Vensel ranks, in order, the five Ravens free agents the team should prioritize based on team need, cost and productivity.