http://www.acmepackingcompany.com/2017/1/27/14420310/packers-free-agency-cornerbacks-ted-thompson-sign-secondary-aj-bouye-logan-ryan-impact
Informative and instructive:
"Last year’s top three free agent cornerbacks received a combined $98.8 million in guaranteed money. If the Packers try to compete in that kind of bidding war, they’re going to have a difficult time retaining any of their own free agents, leaving much of the defense to be populated by (wait for it) draft picks and undrafted free agents.
The next tier of free agents, likewise, presents similar issues. Four of the nine players rated between 70 and 79 by PFF are just 26 years old, which means that any potential bidders should be getting the heart of their prime.
However, this price range also gets tricky. Since most of the top end of the market probably will return to their team of origin, you’ll be in a bidding war even for a second tier player. And secondly, even someone in this range isn’t guaranteed to be any good. For sake of comparison, Ladarius Gunter’s grade for last season was 71.2 before a major regression this year.
Beyond the second tier range, there’s very little reason to consider signing anybody. This is the part of the list that will get you only “young” or “cheap,” leaving you to just cross your fingers and hope for “talented.” The Packers can do better than signing this kind of free agent."