After the first 2 games, with Shields out with another concussion AND potential-laden-sophomores Randall/Rollins getting torched by Minnesota TT knew that CB would be a weak spot moving forward. "Reliable" backup Hyde is a FA after '16 so he may or may not have been in the long-range plans, either.
It didn't take hindsight for 99% of us (or probably the Packer front office) to realize the defensive backfield needed help. TT & the coaches trusted their depth and abilities to weather the storm... and it may sink the playoff-ship. The 2016 trade deadline was after week 8 (& the Atlanta loss). There was plenty of time for a savvy vet with some gas still in his tank to be brought in and there was enough cap room available (I know, there's NEVER enough).
So then you pick up the same kind of junk that's available now and that's your solution? Hate to break it to you but at that point in the year only bums are available, guys that probably would have been rated lower than the bums we had on roster.