Jenks is a good pitcher, but he's fat and out of shape. Expect him to be in great shape next year for his contract drive. You can quote me on it.
As for Oswalt and Cordero, that's the point. They would put us significantly over the threshold this year. Then they would be FA's along with Jenks, Ortiz, and the others, and the Sox would be massively under the cap. Pay now so you can avoid paying later.