if i were to give up sizemore, the only reason i'd do it for a guy like cordero is because it's sizemore. if you somehow hid sizemore's name from me then i would never pull the trigger on the trade. but now with his knee contusion or whatever and given his history, you might thank yourself later for getting some value out of him. this is a tough call, but i think the presumption should be against trading away a productive OF for a (what i think) is a mediocre closer. can the name "sizemore" rebut that presumption? if it's any name, it should be that one, but this is super tough. you can take your chances with closers later (play the LAD or STL closer game...) and there's something like 20 weeks of roto left.
so after rambling on aimlessly, i would target a closer if you need one. but i might aim a bit higher. and the only reason i'm willing to give up a potentially elite OF is because of the dude at issue. this might be confirmation bias at work, but some guys like cruz, hamilton, etc. just get injured a lot. i think sizemore is one of them.