Well that is very good cornerback corps but you need to have safeties and a pass rush to help them out. Take the broncos who in DRC, Chris Harris Jr., Champ and Tony Carter had a decent cornerback corps. DRC and Chris Harris Jr. were ranked very highly as a cornerback duo, and it is a shame DRC is now leaving. Shame the safeties were graded out among the worst ranked, and the broncos lacked pass rush.
With Chris Harris Jr. getting healthy and Talib (a physical presence, who has character issues I'm not comfortable with), the broncos have taken steps to improve the secondary, even if they are overpaying. They need to improve the nickel package, and get a slot corner. I really do rate Chris Harris Jr. very highly.
The Pats now have an elite secondary, but Arizona just called and said, "hi".