If you trade someone like Robles (not saying I want to, but let's say they did), they could probably fill both of those spots pretty well in one fell swoop. I think they'd trade Eaton, though. Which is what I'd prefer them to do if they trade one of those three.
For who?
Look, Robles isn't as valuable as a lot of people on this board want to believe. He's not enough to get you a top line rotation starter unless that pitcher has one year left before FA.