Keep in mind you're generally going to want 20-25 pitchers on your 40 man (currently the Orioles have 27, but 4 are on 60 day DL, so 23). Even if you DFA all of your bullpen backup pieces, you're going to have to sign other ones (and if you sign them to MiL deals, you have to re-add them to the roster if you want to recall them anyways). So you might as well keep Voth, he's better then most of your other options.