I think the Cubs would be a bit hesitant to trade Alcantara as he's basically your back up CFer right now with no one else currently on the roster who can reliably fill in.
I mean there's some drastically different levels of value among them. Like Shaw+Caissie would feel real bad, but Caissie+Assad would feel pretty great.
I'm letting this lack of action annoy me far more than it probably should, but jesus Jed get off your ass and go get your guy. Stop waiting for people to fall into your lap.