I don't think Duffy is a the trade target to pitch in the pen.
This team doesn't need more left handed starters. But I do like Duffy as a pitcher.
I'm all lso not wild about Benintendi add a center fielder and prefer either Bradley or Betts over him out there. But I do wonder how adamant JD Martinez is about not wanting to DH. Is this a serious preference or just a negotiating ploy?
I will say, if the rumors of wanting more years are accurate, not wanting to DH would be a very, very bad negotiating tactic...