Couple things... While Romo's stats aren't good right now, he's got cred because he's closed in the playoffs. Sometimes pitching for a bad club is mental. Look how Hamel improved coming from the Rangers.Kimbrell was bad late last year. The Red Sox won a ring in spite of Kimbrell. They were lucky to clear the Yankees.
Sergio Romo? Really?
That said, I think the Cubs should be able to get a good arm or two for Montgomery. You're not going to get an elite closer, but Montgomery can be a 3 for a lot of teams who aren't contending. That's value.
And Kimbrel is better than anyone the Cubs have now. That's shouldn't be debatable.
Montgomery isn't a 3 on any good team. Not even close.