Xavier Cooper isn't exactly familiar with the 49ers defense, but he knows a lot of the defenders.
Cooper, whom the 49ers claimed off of waivers this week, was one of the defensive linemen who trained alongside Seahawks defensive lineman Michael Bennett in Hawaii during the summer. The group also included a quartet of 49ers: Arik Armstead, DeForest Buckner, Eli Harold and Ronald Blair.
"It kind of felt I was home when I came here," Cooper said.
Cooper said he's in the midst of a cram session this week so he's up to speed with the playbook -- or at least the game plan -- before Sunday's game against Carolina.