If they were trading Duran for prospects, other teams would be open to it 100%, similar to how they traded Quinn Priester. Most other teams weren't going to trade their MLB caliber pitchers, but the BoSox were for the right price.
Rafaela's "best value" may be as CFer, but maybe the best thing for the team is just straight platooning Duran/Rafaela in CF, adding Anthony as LF, moving Campbell to 1B and playing Rafaela at 2B/SS as needed.