Kessler isn't standing straight and his head is down. They are listed the same but I think Froch might have an inch on him.
I don't think Froch is the kind of guy that'll do Triologies. He'd want to keep moving onwards an upwards and rapidly carve out a legacy against all comers. If he beat Kessler he be more concerned with calling out Calzaghe. If he lost to Kessler he'd still be more concerned with calling out Calzaghe.