Keep’em Drop’em Trade’em

Scenario: You’re in a 12 man 2 player keeper pool with strict trade rules. Your commissioner has put in a “one trade only” rule to avoid a summer headache of off-season trades. You have Chris Johnson and are not afraid of a hold-out and have made him a lock for one of your two keepers. You’re other options are: Tom Brady, Ryan Grant and Steven Jackson. All three players have had trade inquiries, all ranging around the same level of draft picks. Who would you Keep? Trade? Drop?