Routt visited the Lions but left without a contract, and is reportedly visiting with an "anonymous" AFC team. The Dolphins, once reportedly in the running, have been rumored to be out.
The Buffalo game underscored the need for some decent press-man CBs in order to keep Devin McCourty at FS. Dennard is promising but still a rookie. Talib will hopefully be solid, but he has some risk, and a 3rd CB would provide insurance in case of injury and also relegate Arrington/Cole to the dime/ST role. That would also allow them to use Chung/Wilson/Gregory as more forward/downhill safeties, and to let the front 7 attack more.
As I suggested elsewhere, if I were BB I'd very quietly sneak Routt in for dinner at the Ground Round, and have something like the following conversation with him: