COACHING Defensive coordinator Austin Armstrong was forced out and ultimately left to take the same role at Houston while defensive backs coach Will Harris left for the same gig at Miami. Billy Napier responded by hiring Vinnie Sunseri of Washington to become co-defensive coordinator and safeties coach, despite his only having two years of experience coaching defensive backs in his last five years at Washington and New England. Deron Wilson of Arkansas was also hired as defensive backs coach. Th…