Two of the biggest additions to the 49ers this offseason were defensive line coach Kris Kocurek and defensive backs coach Joe Woods. Woods replaced Jeff Hafley - a holdover from the Chip Kelly regime - and Kocurek replaced Jeff Zgonina, whom Shanahan knew well from his three years coaching in Houston when Zgonina was still a player.
The early returns have been positive, with both Kocurek and Woods recieving praise from coaches and players alike. Kocurek intends to deploy more wide 9 defensive fronts in 2019, and has also moved Solomon Thomas back to his natural position.