'It took a while, four weeks into free agency. But last week, the Buffalo Bills got busy on the NFL’s open market for personnel. With their salary cap limitations, the Bills had to sit out the initial wave of free agent signings. But after waiting out the market, the Bills signed five players last week at cap-friendly terms. One of the five could wind up as a starter. All of them add depth at critical spots on the roster. And most of them can contribute on special teams.'