I would like to see them re-sign Derek Barnett too, he's been a great addition to the DE position.
Kaimi is also a free agent, so if they don't keep him (he was making 4.4m) then they need a new kicker.
Cameron Johnston the Punter is also a free agent. Made 2.6m last year. Need to sign him or a new one.
Long Snapper Jon Weeks, who has been with the team for like 15 years or something, is also a free agent, but he's like 38. I guess he could play another year, but I would guess he retires soon. (he makes vet min 1.3m)
Cashman would be nice to have if he's cheap, but the guy has missed a lot of games in his short career. He's a huge injury hazard and would be best served as a rotational LB/special teams guy if he is re-signed. They need to find a Demeco Ryans type player to be the QB of the defense!
There are a lot of interesting free agents out there next year, with something like 40m+ to spend after re-signing some important pieces, I think this team could attract some really good talent. I'd like to see them get some veterans in some important positions like Safety, LB, and maybe an interior O-lineman if they can snag one. They should still draft those positions, but if they can get a good vet, that moves the priority down a few rounds. Tons to work with here, I just hope they go for it while CJ is still on a rookie deal.