NO HOMECOMING: Packers tab Jonathan Gannon as defensive coordinator rather than wait on Jim Leonhard

Just hours after "mutual interest" reports around the Packers and Jim Leonhard, the Packers hire former Arizona Cardinals HC Jonathan Gannon. What does Gannon bring to GB? How can he help this team? What do they need to maximize what he does and vice versa? Plus, why the coaching cycle badly needs to be overhauled.