Seriously? Have you looked at 3-5 in the rotation, RF, and LF?
I see no problem at all with Bucholz and Bard at #3 and #4, and the worst case scenario for #5 is that nobody steps up at all and they have to use Aceves there. That could potentially be a problem in the bullpen, where Aceves as the #3 behind Bailey and Melancon is strong and the dropoff from him is large. But, I'm comfortable with the risk of running a tryout camp for the #5 slot. People are underrating the likelihood that Tazawa or Doubront emerges strong and healthy as well, or that Alex Wilson steps up and wins the spot in spring training. With Matsuzaka reportedly ready to return by June, that is another option. Lots of assets here, no worries.
This basically shapes up as me believing that all the fretting about Bard converting to a starter is very similar to all the fretting about Derek Lowe converting to a starter. I expect very similar results. Hence, with a set of 4 number 2 starters, I'm not that worried about the 5th spot.
We don't even know for sure if Crawford is going to miss any time, and if he does it doesn't sound like much, so LF is fine. A platoon of Sweeney and McDonald is the worst case scenario in RF, which is very similar to the Nixon/Buford platoon of 1998 that worked great.
If the target is instead Oswalt, that's a tougher decision. Sure, it's great if Oswalt can pitch anywhere close to his career norms, but (1) even if it works, you're shopping for another short-term fix a year from now, and (2) given Oswalt's health, you're still going into Spring Training with two question marks in the rotation, plus you've created an additional question mark at shortstop.
A year from now you're slotting what is hopefully Lackey 2.0 back into the rotation, as he should be ready to go by spring training 2013.