There's no question that the Green Bay Packers have a young and talented group of players making up their cornerback unit. Jaire Alexander has All-Pro potential, and Kevin King had the second-most interceptions in the NFL last season.
Meanwhile, Chandon Sullivan was excellent when given the opportunities, and Ka'dar Hollman's athleticism and physicality make him a good fit for Mike Pettine's press-man scheme. Although Josh Jackson's career hasn't gone as hoped, he was a turnover machine at Iowa, and hopefully, in Year 3 and under the tutelage of Jerry Gray, we see him take a step forward.
It's these reasons that the Packers haven't brought back Tramon Williams, who still remains a free agent.