I think Julian was supposed to be out until Nathan Varni or whoever intervened. The Olivia made him do it stuff was definitely a retcon.
Nina's worst crimes were against "just" Ava, who was a villainess herself.
Ava as well "just" shot fat AJ. She screwed over Morgan but she didn't kill him. They were doing that pill stuff during Maura West's renegotiations so maybe that's what's happening with Peter. And he'll resign and Peter will redeem himself by selling his hair.
I'm not convinced either Kim or Peter are out, especially Kim, but Peter is committing crimes against Beautiful Sam and that's another matter on this show. They can't do a tumor made him do it again. Well they can but that would be pretty embarassing.