Does anyone think Lohse is actually an upgrade over Det in the rotation?
I think they're probably even, but getting Lohse or Vazquez would be a HUGE win if we had a SP go down to injury, over the kind of 6th SP we could sign right now that wouldn't predicate his signing on being in the rotation over Detwiler.
Vazquez is not signing here unless he's the 5th starter, so you're left with whoever will agree to a long man role/minor league contract (i.e. not a very good pitcher).
While I'd feel semi-bad for Detwiler, this is a team that needs to seize it's opportunity RIGHT NOW. And that doesn't include being sentimental towards late-blooming 1st round draft picks.
You're missing a LHRP and a 6th SP. You get both if you sign another starter and move Detwiler to the pen for a year.