I'm with you there. And with the modest staff the Twins have assembled, there is a chance that we could end up with 4 or 5 starters chugging along at ~90 ERA+, not good enough to really help us contend, but not bad enough to cut.
But a few of these guys still have to prove they can even hit that ~90 ERA+ mark, or sustain it, so I'm not too worried about that scenario quite yet.
You're right that clarity with the 5th spot is going to go a long way, but I'd caution something else. The Twins know that Hughes, Pelfrey, and even Correia have a lot to prove yet to be cemented in a spot, but they're going to be tough to dig out of the rotation because of their contracts.(anyone pretending the Twins are just going to ignore what they signed those men to do based on even two months of poor performances are being really naive. Hell, it may be unfair for the Twins to give up on them at that point even if they are horrible.)
Even still, the Twins know that they are a precarious bunch, which may lead them to keep more of those guys without options than any of us would like to see, just as insurance against collapses. I really have to see how this shakes out before I have ANY confidence in seeing Gibson before June - even if there are injuries or horrid performances.