Green, Sully, Thornton, Bass all seem like possibilities to me. I wouldn't be so quick to trade Sully just because he's frustrated. Green can opt out but I wouldn't be so quick to trade him either. We might be able to get him to stay and get what we want.
I think Green is frustrated with losing too whch isn't a bad thing. Having Green here to me is not bad. I wouldn't trade him just because of that.
Got to be smart imo. We can work things out.