He's going to close no matter where he is, right? Be it SF, Cincy, Florida, Boston, if there's a closer opening and he goes there, he WILL close (unless he gets hurt of course), correct? I don't see anyone trading for him as set-up.
1st- he'll get traded to some sucker
2nd- he'll save 5 or 6 games
3rd- he'll get hurt for a week or 2
4th- he'll save a couple more games
then.... he'll get hurt again
then.... he'll blow 1 or 2 saves, get hurt
then... he'll save 1, blow 1, save 2, blow 1
then... you'll want to drop him, b/c no one will want him in a trade....