NFL free agency is underway, and the Miami Dolphins have gone about their business in a methodical, strategic manner. The headline is the signing of quarterback Zach Wilson to back up Tua Tagovailoa, but they've also held onto a few defensive players while filling holes, particularly on the offensive line and in the secondary. General Manager Chris Grier targeted some value signings that could pay dividends if those players are healthy and perform to their potential.