I don't know if Lugo has a spot here because he seems to be limited defensively from what I remember, but he's still young. He's Rule 5 eligible this offseason, so there's a chance he could be picked. If he keeps swinging a big stick, maybe you could move him for something?
I just figured it'd be silly to move a real starting pitching prospect that is so close to MLB. This isn't a WS contending team, so I don't know what kind of trade they'd be pursuing, but Fitts seems better here for now.