good question. From what I am reading, more NIL will be averted to defensive players esp. on the DL. Carter was a Washington transfer if you recalled. he was 3rd string and saw limited action in mob up duties. if they allowed him to go without a fight is because they believe they have better talent already on the roster as well as the incoming class (Matthews and Howard). for example, Justin Hill who I think has a bright future is only a freshman and he saw more playing time than Carter and that to me is a clear indication where things stand on the pecking order.
I like carter and he'd be good to keep, but if russaw and Pierre stay plus hill coming on, carter's 4th in the depth chart and like you said. More are coming. That said, I wouldn't be shocked if we tried russaw at ilb. He doesnt have the length the NFL usually likes for an edge guy, but has all the measurables they'd want in al ilb.
