Suh's available. Mathieu's available. Sheldon Richardson... There are still premier players available.
A lot of corners moved pre free agency with Talib, Peters, Sherman, Worley, and Randall all moving teams. IMO Gaines was at that tier below Johnson and Butler, and the market shows that. There's a few other guys available, but he's probably better, and more likely asking for a bunch more money. Gaines wants more than Robinson got at 4yrs 20.
Brown's an interesting case because of his fit with certain teams. Patriots won't overpay, but he'd probably fit in there pretty well as a deep lying cover 2 MLB.