Ken Rosenthal revealed that Oswalt threw for Texas, but reportedly, the Rangers are still not sold on the idea of adding the veteran:
— Ken Rosenthal (@Ken_Rosenthal) May 19, 2012
Not only is there not a need for him in the starting staff, but there's also no need for Oswalt in the bullpen. They have a deep bullpen that will be able to hold up over the season without Oswalt.
Rosenthal speculated on a possible scenario to get Oswalt into the starting rotation, stating that the Rangers "could create room for Roy O by moving Lewis. No indication they are considering it. No guarantee Oswalt would be better than Lewis."
This might be the only way that Oswalt finds a spot on the Rangers, and even this is highly speculative. The chances that Oswalt lands in Texas are becoming slimmer and slimmer with every day that passes.
It is only a matter of time before Oswalt is pitching at the MLB level; it likely will not be with the Rangers, however.