don't drop Rhodes...he is still in the mix for saves. Koch on the other hand....well, the only reason he is on your team is for saves, so now that he lost his closer job, he is pretty much useless.
I would have Mr. Zero first, because he should get the majority of the save chances and he has outstanding numbers. Duke is next, with very good numbers, but he will be sharing time with Rhodes for saves, at least in my opinion.