The Tampa Bay Buccaneers were active in free agency this year. They re-signed Doug Martin, signed J.r. Sweezy to be their long-term left guard, signed Brent Grimes, Robert Ayers and Daryl Smith as short-term additions for the defense, and they re-signed a few of their own players to complete the deal. And judging by the past two years, they'll add a few surprise veterans over the next months as well.
When you list those moves out like that, it's no surprise that the Bucs are seen as a winner in free agency.