Yeah, I used to think that Paps was the closer of the future, and that his talent would be wasted in the rotation. Now, I'm not so sure. A couple of things to consider. There are ways to structure a bullpen without an ace closer. Look at the Tigers with Tod Jones and Zumaya. Yeah, Zumaya is a huge stud and will probably close in a year or two, but Detroit could also be seen a a prototype new bullpen - the closer by comittee that actually works. Also, picture this scenario. 5th inning, 2-1 Sox lead, Paps on the hill. Runners on the corners, no outs. Paps steps off the mound, looks at the ground, takes a deep breath, and switches to "closer mode". Thousand yard stare, fist pumps, the whole nine yards. Strikeout, strikeout, feeble pop up. Inning over. Now that's something that I could live with in a starter. Keep the man in the rotation.
That being said, I have no idea who can close at this point. The upshot is that, IMO, they don't need to land an absolute stud closer. Just someone who won't freeze up in Boston and crumble under the considerable pressure.