Cordero pitched in Yellowstone Park and allowed 13 home runs, Gonzalez, for all his effectiveness, walked a ridiculous 5+ batters per nine innings.
Gonzalez isn't going anywhere. I don't see why people look at the Braves (after trading Adam Laroche) and see 3 relievers and figure, "hey, they must need to trade one of them". Good bullpens have three good relievers. It's happened before. Hell, some bullpens have 4 good relievers. I'm sure they're perfectly aware that Wickman could very well be their 3rd best option at this point, and could implode at any time, regardless.
Cordero is the only quality closer available out there, but even he has a ton of question marks (awful HR rate, lackluster K rate), and is an NL closer to boot. That's even before factoring in that you'd need a king's ransom for him.
The Red Sox made an offer to a closer on the market with 190 career saves in the AL, a team postseason hero, who unfortunately would rather play for less money elsewhere because he was run out of town by nitwits while struggling/recovering from injuries. If Foulke does well in Cleveland while someone else flounders in Boston, that's clearly on the shoulders of the douches that made his life a living hell as a clear sign of ingratitude after he nearly ended his career bringing a championship to Boston.
There was no sure-thing on the market this winter, and regardless, teams who throw s*** up against the wall are just as likely to find a reliable closer than those who have overpaid for question marks.