Might depend on who you already have. Say you don’t have B Smith (cheap) or Greenwood (getting cheap and playing pure mid seemingly, note drop in tackle count) or Trac (#1 forward? Durable with game in hand) then I can see the merit in getting Duncan and leaving room for one of those names up forward. The reverse is also true, but other than Titch and Cripps (and Duncan himself) I’m not sure that there are standout trade in mid options.