Here is my take - The team has some very bad contracts on the books that they were left with. We also don't have a roster that is capable of competing with the perennial playoff teams like Pitt, GB, NE etc. It's not a total blow-up, but at the same time we need to add talent across the roster at multiple positions. Corner, WR, LB, QB Etc. But we also need to add talent at a cost effective price.
Sammy probably was gone after the year which at best nets you 1 3rd round pick in 2019. We got a 2nd round pick in 2018.
Darby was a good young corner who had ups and downs - but he wasn't a spectacular player by any means. He had a very poor 2016 season.