Yes, I believe that you are correct. Even if something clicks for him this season and he plays well, I don't know if they would give him a new contract.
I don't think that is near true.
Carter has been mediocre but mediocre happens.
You still need those guys when it is scrub city after them.
Carter has largely been healthy and on the field.
If he doesn't command a large salary and wants to return chances are overwhelming that he does.
Durant is a free agent.
Rolando McClain is a free agent.
Holleman is retired.
Sean Lee will be coming off a missed season making millions.
Wilber can't start even on this bad defense with injuries to 2 starting LB.
Truth is Bruce Carter is the best bet of those guys to come back.
McClain has to navigate the minefield that is his own brain and remain a good price fit for the long term risk.
Durant has to get and stay healthy.
Lee has to prove healthy and then possibly restructure.
Carter is a FA that we will own negotiating rights to. He is uniquely set up to return.