Kessler is a serius guy, training for the Haussler fight, he'll be back to fight the big guns later on , Froch is not a big gun!
I would give Zuniga, Bika, and Andrade a very good chance to beat Froch. Kessler, Taylor, Pavlik, and a few others mind indeed kill him! Well, maybe not kill him, but Kessler and Pavlik would both make fairly short work of him, and Taylor would humiliate him over 12 rounds. The good news is that Taylor is suppose to be the first mandatory for the winner of Froch/Pascal. Froch will beat Pascal, and then JT will beat Froch something like 10 rounds to 2.